Abstract:
A method of operating a hardware system, including a computer, for use in registering attendees at large gatherings, such as trade shows or conventions, and producing embossed identification and inquiry cards for each attendee. A plurality of data input terminals are used to supply information concerning each attendee to the programmed computer. Entered data is edited under software control before being stored by the computer. Appropriate portions of the entered data are transmitted to one of a plurality of card embossers where an identification and inquiry card is prepared. The entered data is retrieved from storage as desired to provide statistical information concerning attendance at the trade show or convention.

Description:
This is a continuation of application Ser. No. 443,422 filed Feb. 19, 1974, now abandoned, which is a continuation of application Ser. No. 278,540, filed Aug. 8, 1972, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates to computer controlled data systems and, more particularly, to a programmed computer system for the production of embossed cards and retrievable data. 
     The primary application for the methods of this invention is the registration of attendees at large gatherings, such as trade shows or conventions. In many fields, periodic gatherings of large numbers of persons with the same interests or for same purpose are very common. For example, a trade association of companies in some particular field may stage each year a trade show of selected products manufactured or sold by its exhibiting member companies. Such a trade show is an important marketing method for the participating firms. New products may be introduced, old products advertised, and so forth. 
     Attendance at such gatherings may total many thousands of persons. Generally, the organization sponsoring the event wishes to have detailed information concerning the many attendees. This may include, for example, such usual data as attendee name, company name and address and such statistical information as company size, job title, area of interest, type of company and so forth. This data is of interest to both the sponsoring organization and the participating or exhibiting companies. 
     In order to collect the desired information, large meetings such as conventions and trade show generally utilize an attendee registration procedure. The registration procedure is the first of the two principal functions of the preferred embodiment of this invention. Current registration practices require an attendee to fill out a written document with the information desired by the sponsoring organization. The documents are then sorted and collated, quite often by hand, to obtain the desired information. Quite often, usually because of the time required to sort the data, the information is not available to the interested parties until after the conclusion of the meeting. 
     Many trade shows and conventions are used by exhibitors to provide information to attendees about their products or services. While some information may be obtained about a product or service at an exhibitor&#39;s booth, it very often is necessary for an attendee to give his name to an exhibitor so that requested information may be supplied to him at a later data. Traditionally, the information necessary to answer such an inquiry has been obtained from an attendee and copied out by hand by an exhibitor. As may be readily appreciated, such handling of an attendee inquiry is very time consuming. The practical result often is that many otherwise interested attendees never request information of an exhibitor because of the necessary wait at a busy exhibit. This is, of course, advantageous for both the exhibitor and the attendee. 
     An improvement in the traditional inquiry system described above has been used at some shows and conventions in recent years. Embossed plastic cards are produced, similar to the familiar credit card, which bear the attendee&#39;s name and address. Each exhibitor is provided with preprinted forms and a card imprinter. When an inquiry is received, the exhibitor imprints a form with the inquiring attendee&#39;s card and writes in only the requested information. The inquiry card procedure saves great amounts of the exhibitor&#39;s time, reduces the number of personnel necessary at the exhibit and reduces the time that each attendee must wait to record his inquiry. Production of the embossed card used in the inquiry procedure is the second of the two principal functions of the preferred embodiment of this invention. 
     While the inquiry card procedure described above is a considerable improvement over the traditional hand written method, there are many problems in its use. Each card must be embossed from data entered by hand. Since this process requires personnel to operate each card embosser, it is quite expensive. While the inquiry cards may be embossed for those persons who are expected at a show or convention, often the attendee must visit in a second line, following his registration, for his manually embossed card to be produced. If the line becomes too long, the attendee may be asked to return later to obtain his inquiry card. This is very unsatisfactory, since the attendee cannot make any inquiries during this period or the exhibitors must be prepared to record written inquiries. 
     In summary, the present registration and inquiry sytem in use at most trade shows and conventions is unsatisfactory for a number of reasons. Satistical data concerning attendees is often unavailable for considerable lenths of time after the conclusion of the show or convention. Since the data handling, both for registration and inquiry, must be performed by hand, it is both slow and expensive for the organizers and exhibitors. Finally, the very considerable periods of waiting required by the attendees is unsatisfactory to them. 
     SUMMARY OF THE INVENTION 
     In accordance with this invention, provision is made for a computer controlled process which combines the registration procedure for large trade shows or conventions and the production of embossed inquiry cards for attendees. Registration data is entered from terminal devices, which may take several forms but are cathode ray tube terminals in the preferred embodiment. A programmed general purpose computer edits and formats the entered data and transfers it to storage. Under computer control, selected statistical information may be retrieved from storage and read out to provide up-to-the-minute attendance statistics. Further, under computer control, certain of the entered registration information is extracted and transferred to card embossers which automatically produce inquiry cards under computer control. 
     Since registration information is retrievably stored in a computer system , desired statistics may be retrieved at will. Unlike the prior methods in which the information often does not become available for long periods of time, this invention provides for virtually instantaneous production of statistical information concerning attendees. 
     Except for the initial data input, all data handling in this invention is under computer control. As a result, fewer persons are required to operate the system which saves considerably on the costs of registration and inquiry card production as compared to the manual methods currently in use. 
     Finally, since show and convention attendees are registered and presented with their inquiry cards in a very short time, most of the previously experienced waiting is reduced or removed. For example, it has been found that in use of this invention at a large trade show, the total waiting time of each attendee after he presented his registration information to the operator of an input terminal device until he received his inquiry card was about thirty seconds. In that thirty second time period, registration information concerning the attendee was retrievably stored, certain data extracted and transferred to an automatic card embosser which produced his inquiry card. 
     Accordingly, it may be seen that the many problems attendant to the present method of trade show and convention registration and inquiry system have been alleviated by this invention. Further, the cost of operating such systems have been considerably reduced. 
     It should be noted at this point that the primary purpose of this invention is the handling of entered data and the production of embossed cards. The practical embodiment of this invention has been used in the registration and inquiry system described above. However, it should be realized that this is only an example of the application of the methods of this invention. Another very useful application of the invention is found in the production of embossed credit cards used in consumer credit businesses. Accordingly, while this invention will be described in connection with the operation of a registration and inquiry system, it is pointed out that the use of the invention is not limited to such an application. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a block diagram of the hardware system of this invention, illustrating three of the maximum of ten input terminals and three of the maximum of five automatic card embossers, as well as the computer and peripheral equipment. 
     FIG. 2 is a high level flowchart of the system, showing the interconnection of the various software modules of this invention. 
     FIG. 3 is a flowchart of the initial portion of the Interrupt Monitor software module. 
     FIG. 4 is a flowchart of the cathode ray tube (CRT) Processor portion of the Interrupt Monitor module. 
     FIG. 5 is a flowchart of the Operator&#39;s Console Processor ((OPCP) portion of the Interrupt Monitor module. 
     FIG. 6 is a flowchart of the Embosser Processor (EMBP) portion of the Interrupt Monitor module. 
     FIG. 7 is a flowchart of the portion of the Interrupt Monitor module to which the flowcharts of FIGS. 4 , 5 and 6 return in order to determine whether there are pending interrupts from any portion of the system. 
     FIG. 8 is a flowchart of the Cathode Ray Tube Monitor (CRTM) software module which is called by the flowchart of FIG. 4 to service interrupts from the cathode ray tube terminals. 
     FIG. 9 is a flowchart of the initial portion of the Embosser Monitor (EMBM) software module which is called by the flowchart of FIG. 6 to service interrupts originating from the automatic card embossers. 
     FIG. 10 is a flowchart of a portion of the Embosser Monitor software module showing the first mode (EMOD 1) of operation (character after character) of the embosser hardware. 
     FIG. 11 is a flowchart of a portion of the Embosser Monitor software module showing the second mode (EMOD 2) of operation (function after character) of the embosser hardware. 
     FIG. 12 is a flowchart of a portion of the Embosser Monitor software module showing the third mode (EMOD 3) of operation (character or function after function) of the embosser hardware. 
     FIG. 13 is a flowchart of a portion (ECNTL) of the Embosser Monitor software module which is called from the flowchart of FIG. 9 for the purpose of counting ten millisecond interrupts to provide operation timing for the automatic card embossers. 
     FIG. 14 is a flowchart of a portion (EGETD) of the Embosser Monitor software called from the flowchart of FIG. 9 for the purpose of transferring data from an embosser buffer for use by an automatic card embosser. 
     FIG. 15 is a flowchart of the initial portion of the Master Controller software module which controls the transfer of data within the system and controls translation of the entered data to the proper embosser code. 
     FIG. 16 is a flowchart of a portion of the Master Controller software module called from the flowchart of FIG. 15 for the purpose of accepting inputs from the operator&#39;s control console. 
     FIG. 17 is a flowchart of a portion of the Master Controller software module called from the flowchart of FIG. 15 for the purpose of accepting data from input terminal storage buffers. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A. Introduction 
     In the use of the methods of this invention as a registration and inquiry system, the hardware is arranged generally as shown in FIG. 1. Up to ten cathode ray tube terminals 20, in the preferred embodiment, are positioned at points of attendee entry into the convention or trade show sight. An operator is positioned at each terminal to accept information from each attendee. As the information is provided, the operator types the data into the terminal in the usual fashion. Before the information is displayed on the entering terminal display screen, it is routed to a central computer 21 where the entered characters are edited. As will be explained in detail in connection with the flowchart section herein, certain characters are not accepted by the card embossers and certain characters may not be used in designated locations on the embossed card. For example, the first line of data is generally the name of attendee and may not include a numeral. If the characters entered from the terminal are found acceptable by the computer, the data is routed back to the entering terminal 20 over the same connecting line 22. It should be noted here that while a terminal operator does not enter data directly onto the terminal screen, the data is written under computer control so quickly that it would appear to the operator that the data is directly written on the screen. 
     When the returned data is displayed at the terminal, both the terminal operator and the attendee may inspect it for accuracy. Any change in entered data, as, for example, the correction of a misspelling, is rerouted to the computer 21 for editing before the correct character is replaced at the terminal. When the attendee and the terminal operator are both satisfied that the entered data is accurate, an entry command is made at the terminal. The computer 21 transfers the entered data to a tape memory unit 23 and into buffer storage for CRT terminal entries, as will be explained below. When a CRT buffer is full and a card embosser 24 found to be available, the portion of the entered information which is to be embossed on a card is transferred a character at a time via parallel lines 25 to a specific embosser. The embosser accepts the transferred data characters and produces the inquiry card. The attendee then obtains his card at the embosser outlet and proceeds into the convention or trade show exhibit area. 
     A standard teleprinter console 26, which utilizes a Teletype device in the preferred embodiment is used by a system operator to give commands to the computer 21 and receive requested statistical information from the computer. While a Teletype console is used in the preferred embodiment, as may be readily appreciated, any standard keyboard device will suffice. 
     B. The Hardware System 
     Registration data supplied to the system of this invention is entered through up to ten cathode ray tube terminals. In the preferred embodiment, a Model VISTA-1, manufactured by Inforton, Inc., Burlington, Mass., is usd as the terminal device. The Infoton cathode ray tube terminal is equipped with the usual alphanumeric display screen and a keyboard for character and function entry. In the operation mode used in the preferred embodiment, as discussed previously, there is no direct communication between the terminal keyboard and the display screen. Each keyboard entry is immediately transmitted to the computer where it is edited. If the editing function determines that the entered character is one acceptable for display on the terminal screen and use in the system, the character is returned for display by the terminal. The time lapse between keyboard character entry and screen display is quite short so that an operator is not aware of the editing intervention of the computer. There is no buffer storage in the terminal utilized in the preferred embodiment. Accordingly, characters are transmitted to the computer as it may receive them. 
     While the particular terminal described above has been utilized in the preferred embodiment, it may be readily appreciated that any number of different alphanumeric display terminals or even non-displaying terminals, such as Teletype devices, may be utilized. 
     The teleprinter console utilized in the system of FIG. 1 is a Model 33 Teletype device manufactured by Teletype Corporation, Skokie, Ill. The console is a standard device and will not be described in detail here. All that is necessary for understanding of the operation of the system of FIG. 1 is to recognize that the Teletype console is a keyboard device capable of both sending and receiving data. 
     The programmable general purpose computer utilized in the preferred embodiment of the system illustrated in FIG. 1 is a NOVA 1200 minicomputer, manufactured by Data General Corporation, Southboro, Mass. The computer utilizes a sixteen bit word and includes a four thousand word core memory. Since the computer and descriptive information is readily available, no structural or programming details concerning it will be given. In the event further information is required about the computer, reference is made to manual DG NM-5, published by Data General Corporation in 1971. 
     It is understood, however, that virtually any make and type of programmable computer may be employed in this invention. Changes in the make and type of computer would necessitate only minor program language and structure changes, well within the skill of an average programmer. 
     Bulk memory utilized in the preferred embodiment of the system of FIG. 1 is a magnetic tape unit, Model 6X40, manufactured by Peripheral Equipment Corporation, Chatsworth, Calif. Data is stored on a twelve inch magnetic tape reel. Operation of the tape unit is standard. If further information concerning the details of the tape is necessary, reference is made Manual No. 100884, published by the Peripheral Equipment Corporation. As with the other hardware units employed herein, other makes of tape storage units or even other types of storage devices, such as discs, could be readily employed in this system. 
     A maximum of five card embossers may be utilized with the preferred embodiment of the system illustrated in FIG. 1. The embosser utilized in the preferred embodiment is a Model 6800 embosser manufactured by the Addressograph-Multigraph Corporation, Cleveland, Ohio. 
     As the embosser is used in this system, it automatically loads a plastic card from a supply of such cards. As characters are transferred to it from buffer storage under control of the computer, the characters are embossed in the plastic card. Since embossers utilize a special data code, the internal code used in the system is translated into a form acceptable to the card embossers under software control. 
     c. Software 
     1. Introduction 
     All functions of the hardware system which constitute this invention are performed under software control. The program listing is included herein following the descriptive portion of this specification. FIGS. 2-17 of the drawings contain flowcharts of the principal portions of the software according to this invention. In order that the methods of this invention be clearly understood, this specification will describe the software flowcharts illustrated in the drawings. 
     Before describing in detail the methods controlled by the software of this invention, it is believed that it would be helpful to understand the exact nature of the data entered in the preferred embodiment. Generally, five types of information are entered via a CRT terminal concerning each attendee. These are the attendee&#39;s name, company name, attendee and company address. In addition, statistical information such as title, company size, area of interest, types of products manufactured, and so forth, may be entered. In the preferred embodiment, up to five lines of information is embossed by the card embossers on a plastic inquiry card. This information consists of the attendee&#39;s name, title, company name and address. In the preferred embodiment, the card may contain a maximum of 132 characters. An additional twenty characters may be entered from the CRT terminal for statistical information. 
     Accordingly, a maximum entry for a single attendee would comprise 152 characters of data. The 152 characters comprises, on the magnetic tape memory unit, a logical record. The logical record size remains constant on the magnetic tape regardless of the actual number of characters entered concerning an attendee. 
     Generally, the software disclosed herein operates an interrupt system. The software processes interrupts from cathode ray tube terminals, the operator&#39;s console, the magnetic tape memory unit, the power failure automatic restart device and the computer real time clock. Upon detection of an interrupt, the software classifies the interrupt and calls the appropriate software module. On each machine interrupt, the machine&#39;s state is saved in a last-in-first-out table. After all higher priority interrupts are serviced, control is returned to the last entry in the table so that operation of the machine may take up at the point it was interrupted. 
     As in most interrupt systems, the interrupts are serviced by the system according to a previously determined priority schedule. The priority schedule, in descending order, is the CRT terminals, the operator&#39;s console, the embossers and the magnetic tape unit. 
     There are six primary modules in the software listing included in this specification: Interrupt Monitor; Master Controller; CRT Monitor; Tape Monitor; Operator&#39;s Console Monitor; and, Embosser Monitor. Of the six in the software listing, the four principal modules are represented in the flowcharts. The Interrupt Monitor module is disclosed in FIGS. 3-7; the CRT Monitor module is disclosed in FIG. 8; the Embosser Monitor module is disclosed in FIGS. 9-14; and, the Master Controller module is disclosed in FIGS. 15-17. 
     2. FIG. 2 Flowchart 
     An understanding of the overall method controlled by the software of this invention may be had by referring to FIG. 2 which illustrates, on a high level, the interrelationship of the various software modules. The background step 30 is the entry point into the software method. The first initialization step 31 is reached by a startup of the system from the operator&#39;s console via step 30 or an automatic restart of the system via start step 32 following a power failure. The first initialization step 31 controls such functions as initializing the computer&#39;s ten millisecond clock, which is utilized as an embosser interrupt, setting all code words in core to their initial values, zeroing the contents of the various buffers and enabling all interrupts. 
     The second initialization step 32 tends the start-up requirements of the embossers. The buffers and data lines on the embossers are cleared and a check is made for any pending embosser error. At this point, the system is prepared to operate, that is, to service interrupts from any of the four possible sources. 
     Following the two initialization steps, an interrupt decision step 36 checks the four possible sources of interrupts to determine if one is pending. If not, control is transferred to an initialization message decision step 37 which determines whether there is an input requiring re-initialization from the operator&#39;s console 26 (FIG. 1). If there is no such console message, the initialization message decision step 37 retransfers control to the interrupt decision step 36. If the initialization message decision step 37 finds wording initialization input from the operator&#39;s console, control is passed to the first initialization step 31 and the initialization procedure repeated. 
     In general, the software controls a two step looping operation between interrupt decision step 36 and initialization message decision step 37 until either an initialization message is received from the operator&#39;s console or an interrupt is detected from one of the four possible sources. When an interrupt is detected, control is immediately transferred via a foreground entry point 38 to the Interrupt Monitor module entry (INTM) 39. 
     The Interrupt Monitor software module is called whenever an interrupt is detected from any of the four possible sources of interrupts. The function of the Interrupt Monitor module is to disable all other interrupts, save the machine state at the time of the interrupt, determine which of the four types of interrupts has been received and pass control to the proper software module determined by the source of the interrupt. Finally, the Interrupt Monitor determines whether any interrupts are received during the processing of a previously received interrupt. 
     This process is broadly shown in FIG. 2 by a classification and branch step 40 which identifies the type of interrupt and transfers control to one of four processor branches 41, 42, 43, 44 dependent upon the prior identification. For example, if the interrupt detected by the interrupt decision step 36 had been an embosser interrupt, control would be passed to embosser processor step 43. It should be understood at this point that an &#34;embosser interrupt&#34; does not originate with an embosser. The interrupt is generated by a ten millisecond clock which is part of the computer. By software, the computer interprets the ten millisecond clock interrupt as one requiring servicing of the embossers. 
     It should also be noted here that the flowcharts in the following figures disclose details of the program steps for the CRT processor 41, the operator&#39;s console processor 42 and the embosser processor 43. The magnetic tape processor is operated in the usual fashion common to transfer of data to such memory devices. While the instructions for transfer of data to the magnetic tape memory unit are included in the program listing herein, no flowchart statement of the program is given. 
     Following the servicing of the device originating the interrupt detected by the interrupt decision step 36, control is transferred to more interrupts decision step 45. Basically, the purpose of decision step 45 is to determine whether further interrupt servicing is necessary. For example, an interrupt may have been received during the processing time of the prior interrupt detected by the interrupt decision step 36. In that event, decision step 45 will transfer control to the Interrupt Monitor entry step 39 and the above process will be repeated. Also, if a low priority interrupt is in the process of being serviced when a higher priority interrupt is received, the Interrupt Monitor will first service the higher priority interrupt. In such cases, more interrupt decision step 45 will also retransfer control to the Interrupt Monitor entry step 39. 
     As explained above, the four possible sources of interrupts according to this invention are assigned a relative priority. If, for example, the software is in the process of controlling transfer of a data record to the magnetic tape memory unit and a CRT terminal interrupt is received, the address of the next tape transfer instruction is saved in the last-in-first-out table, In such cases, the more interrupts decision step 45 controls the computer to return to the last table entry and complete servicing the prior but lower priority interrupt. In those instances where no intermediate interrupts nor any prior interrupts require servicing, control is transferred to the Master Controller Monitor module 46. 
     Generally, it is the function of the Master Controller module to examine a system status word to determine if data requires moving. The status word informs the Master Controller whether any cathode ray tube terminal buffers are full, whether any teleprinter console messages are waiting to be printed on the teleprinter, whether data is ready for transfer to the magnetic tape memory, or whether data is ready for transfer to one of the embossers for the production of an embossed card. 
     The Master Controller module determines in a messages decision step 47 whether any such data transfers are necessary and, if so, which data transfer is ready. When a data transfer is found to be appropriate by the message decision step 47, control is transferred to a processing step 48 which calls the proper message transfer routine to accomplish the transfer. Thereafter, control is retransferred to the any messages decision step 47 to determine whether further data transfers are ready. Finally, the Master Controller Monitor updates the system status word to reflect the data transfer which has just taken place. 
     In those instances where the any messages decision step 47 finds no data transfers ready, control is transferred to the background portion of the software to await the next interrupt or initialization message from the operator&#39;s console. 
     The above description concerning the steps of FIG. 2 describes the operation of the methods of this invention on a high level. FIGS. 3-17 will explain the software steps in more detail. 
     3. Interrupt Monitor 
     Referring to FIG. 3, the initial portions of the flowchart of the Interrupt Monitor software module is shown. When the background interrupt-initialization message loop (FIG. 2) finds an interrupt, control is transferred to an initial step 51 of the Interrupt Monitor. The initial step 51 first disables the other interrupts for the duration of the present Interrupt Monitor control. In addition, the initial step 51 enters the present machine state in the last-in-first-out table so that control may be returned to the proper point in those cases where a lower priority interrupt was stopped. 
     The first determination made in the Interrupt Monitor module is whether the interrupt was a system power failure by a power failure decision step 52. In those instances where a power failure occurs, control is transferred to a clearing step 53 which removes any data on the embosser input lines and sets the system for automatic restart. Thereafter, all operations are halted as commanded by a halt step 54. 
     In those instances when the background software steps detect an interrupt which is not a power failure, a fielding step 55 receives the interrupt flag and transfers contol to clock interrupt decision step 56. In the method according to this invention, a clock interrupt is generated in the system by the computer every ten milliseconds for the purpose of scanning and timing the embossers. Upon occurrence of each clock interrupt, a scanning of the condition of all embossers is initiated. Determinations are made during the embosser scanning of the condition of each embosser and whether card embossing commands are necessary. Also, as will be explained below in detail, operation of the embossers require numerous timed delays. All such delays controlled by software steps are based on counts of the number of ten millisecond clock interrupts. 
     Clock interrupt decision step 56 determines whether the sensed interrupt originated with the embosser ten millisecond clock. If so, the embossers must be serviced and control is transferred to the software steps of FIG. 6 via a transfer step 61. 
     If the interrupt sensed in the software background steps is found not to be a ten millisecond clock embosser interrupt, control is transferred to a tape entry interrupt decision step 57 which determines whether the interrupt was caused by a command to transfer stored data from the tape to the operator&#39;s console. If so, control is transferred to a tape processing step 58. The tape processing step controls transfer of the entered attendee registration information to the operator&#39;s console to provide attendance information. As the data is transferred, an error check is also controlled by processing step 58. 
     If the detected interrupt was neither a ten millisecond clock interrupt nor a tape entry interrupt or, following the processing of a tape entry interrupt, control is transferred to an operator&#39;s console interrupt decision step 59. If the interrupt is found to have originated with the operator&#39;s console, control is transferred to the software steps of FIG. 5 via a transfer step 60. 
     Finally, if the fielded interrupt is neither a power failure, ten millisecond clock, tape or operator&#39;s console interrupt, control is transferred to a CRT terminal interrupt decision step 62. As with the above classification steps, the decision step 62 determines whether the detected interrupt is from one of the CRT terminals. If it is found to be from one of the terminals, control is transferred to the software steps of FIG. 4 via transfer step 63. 
     Following the determination by decision step 62 of whether a CRT terminal interrupt is present, control is transferred to the software of FIG. 7 via a transfer step 64, labeled CKINT in FIG. 3, when no CRT terminal interrupt is found. 
     The steps of FIG. 7 are entered upon the completion of all interrupt determinations of FIG. 3 except when an interrupt is caused by a power failure. The basic purpose of the steps of FIG. 7 is to check for a pending interrupt which occurred during the processing of the last interrupt or which was in process when a higher priority interrupt occurred. 
     Referring to FIG. 7, after any pending interrupt is acknowledged by step 70, control is transferred to a decision step 71 which determines whether any interrupts are pending for any reason. If a pending interrupt is found, control is transferred to background decision step 72 which determines whether the last entry in the last-in-first-out table was a background step. The significance of the table entry being found to be background step is that the interrupt last serviced occurred while the software was controlling a background wait and, therefore, the pending interrupt occurred in the interim. In such an instance, the interrupt must be classified and serviced as previously described in connection with FIG. 3. Accordingly, if the last table entry was a background step, control is transferred via transfer a transfer step 73, labeled FLDIN in FIG. 7, to entry transfer step 74, similarly labeled, of FIG. 3. Thereafter, the interrupt which occurred after the servicing of the last interrupt started is classified by the steps of FIG. 3 as previously explained. 
     When the steps of FIG. 7 find a pending interrupt and find also that the last-in-first-out table entry was not in the backgound, control is transferred to a priority decision step 75 which determines whether the priority of the table entry, according to the interrupt priority schedule, was equal to or greater than the priority of the current interrupt. If the priority of the current interrupt is equal to or higher than the last table entry, control is again transferred to the software steps of FIG. 3 via a transfer step 76, labeled FLDIN in FIG. 7. As before, this serves to transfer control to the classification steps of FIG. 3 via an entry, transfer step 74. 
     In those cases where the priority of a pending interrupt found by the steps of FIG. 7 in higher or equal to that of the current interrupt, step 77 controls the fielding of the last table entry. Since the table entry contains, as is usual, the address of the interrupted procedure, restoring steps 80, 81 control the computer to return to the interrupted sequence. At the same time, the current interrupt and its assigned priority is entered in the last-in-first-out table so that it will be handled in the proper priority sequence. 
     If the software steps of FIG. 7 find no pending interrupt, control is transferred to a table decision step 83 to determine whether more than background entries are in the last-in-first-out table. If not, the current interrupt is determined to have been completely serviced and step 84 enables all interrupts. The purpose of this step is to offset the effect of the interrupt disabling which occurred in step 51 of FIG. 3. After the interrupts are enabled, all sources of interrupts, regardless of their priority, are capable of immediately interrupting operation of the system. After the interrupts are enabled, control is transferred to the Master Controller software module via a transfer step 85. The Master controller software flowcharts are disclosed in FIGS. 15-17 and will be described below. 
     If the table decision step 83 determines that there are more than background entries in the last-in-first-out table, the significance is that a prior processing sequence, not involving interrupts, was stopped and should be restarted. In order to accomplish this result, control is transferred to restoring steps 80 and 81 and proceeds as previously described. 
     As may be readily understood, the primary purpose of the software steps of FIG. 7 is to determine whether any pending interrupts are present and to set up the assigned priority schedule for the four possible sources of interrupts. It should be noted that, except for the tape entry process step 58 of FIG. 3, control is retransferred to the steps of FIG. 7 following the servicing of all interrupts. 
     Returning to FIG. 3, it is recalled that the software steps were for the purpose of classifying the type of current interrupt and transferring control to the proper device processor. For example, if the CRT interrupt decision step 62 determines that the origin of the current interrupt is one of the CRT terminal devices, control is transferred to the CRT processor step of FIG. 4 via transfer steps 63 and 88 (FIG. 4). 
     4. CRT Processor 
     The primary purposes of the steps of the CRT processor shown in FIG. 4 are to control the necessary buffer checks for transfer of entered data and to call the CRT Monitor software module. 
     Each CRT terminal device is assigned a code and has associated with it an input buffer. As each character or function key on the CRT keyboard is depressed, a CRT terminal interrupt is generated. When the interrupt is found to be the first following an enter code, the steps of FIG. 4 assign a packed buffer location to eventually receive the terminal entries. As each following interrupt occurs, control is transferred to the CRT Monitor steps of FIG. 8 which first identifies the type of input. If the input is a character, it is edited to ensure that it is a character acceptable to an embosser. If it is found acceptable, the character is returned to the entering terminal for display on its screen. At the same time, the character is entered into the terminals input buffer. When the terminal operator has completed the entries concerning a single attendee, an enter command causes the input buffer to transfer its contents to the assigned packed buffer. The Master Controller is then notified that data is ready for an embosser. These steps will be explained in detail in connection with the software steps of FIGS. 4 and 8. 
     Returning to FIG. 4, if a terminal decision step 91 determines that the CRT terminal is not busy, which would occur only upon the entry of the first character, a buffer decision step 95 determines whether a CRT packed buffer location is available. If not, the CRT terminal entry is not transferred to the entering terminal for display. The data entry, however, is saved. Thereafter, return is made via a transfer step 98 to the steps of FIG. 7. 
     When the buffer decision step 95 determines that a buffer location is available in the packed CRT buffer, step 99 controls the buffer locations to be cleared and the buffer flag set after which control is transferred to CRT Monitor calling step 92. 
     5. Operator&#39;s Console Processor 
     As explained in connection with FIG. 3, operator&#39;s console decision step 59 determines whether a detected interrupt originated with the operator&#39;s control console. If so, control is transferred to the Operator&#39;s Console Processor steps of FIG. 5 via a transfer step 60. 
     FIG. 5 illustrates the software steps of the Operator&#39;s Console Processor. Briefly, the purpose of the Operator&#39;s Control Processor is to transfer Teletype data and to notify the Master Controller module that a command is waiting to be processed. 
     Referring to FIG. 5, control is transferred to a read step 100 via transfer step 60 of FIG. 3 and entry step 101 of FIG. 5. Step 102 enables all interrupts from the various interrupt sources and transfers control to message waiting step 103. If it is determined that a console message is waiting, all other interrupts are disabled by step 104 after which transfer step 105 returns control to the steps of FIG. 7. After the FIG. 7 steps occur, the Master Controller module, as will be discussed below, controls the transfer of the waiting console message. If no console message is found to be waiting by decision step 103, control is transferred to step 107 which turns on a console message flag. Thereafter, control is transferred ultimately to the Master Controller module via transfer steps 105 and the software steps of FIG. 7, as above described. 
     6. Embosser Processor 
     As discussed in connection with the steps of FIG. 3, an embosser interrupt is generated in the system by a real time clock every ten milliseconds. When the ten millisecond interrupt occurs, interrupt decision step 56 of FIG. 3 detects the clock interrupt and transfers control to the Embosser Processor of FIG. 6 via transfer a step 61. 
     The primary purpose of the Embosser Processor steps of FIG. 6 are to call the Embosser Monitor software module, enable only the proper interrupts and control a scanning of each of the embossers in turn. Referring to FIG. 6, step 110 enables the CRT and Operator&#39;s Console interrupts. Step 111 identifies the first embosser to be checked after which step 112 calls the Embosser Monitor software module of FIGS. 9-14. The Embosser Monitor module controls the transfer of data from an embossor buffer to the corresponding embosser. Following the Embosser Monitor steps, which will be described in connection with those figures, restart step 113 of FIG. 6 causes the ten millisecond clock to be restarted and all interrupts to be disabled. Word step 114 then picks up the embosser communication word which states the status of the embosser just serviced and, via pointers, the present condition of the embosser. 
     Decision step 115 determines whether the embosser being looked at is busy, that is, embossing a card, or is idle. If the embosser is found to be either busy or idle, control is transferred to decision step 116 which determines whether there are more embossers in the system which must be serviced as a result of the current ten millisecond embosser interrupt. If decision step 116 determines that there are more embossers to be serviced, the above described process is repeated by transferring control back to the Embosser Monitor call step 112 via embosser set-up step 118. As may be readily appreciated, each time a ten millisecond embosser clock interrupt is received, the software steps of FIG. 6  are looped through until decision step 116 determines that all embossers connected to the system have been serviced. When step 116 determines that all embossers have been serviced, the steps of FIG. 6 is exited to the steps of FIG. 7 via transfer step 120. Each embosser in the system, is serviced every ten milliseconds or one hundred times each second. 
     Returning to the embosser busy or idle decision step 115, control is transferred to card finished decision step 121 if it is determined that the embosser being looked at is neither busy nor idle. In such a case, the embosser is either in an error condition, is turned off or has just completed embossing a card. Step 121 determines whether the embosser has finished embossing a card. If the embosser is finished, control is transferred to step 123 which frees the embosser buffer. This removes the embosser from a reference list of embosser buffers being utilized and frees it for receipt of further data. Thereafter, step 124 sets the embosser flag to idle and increments the embossed card count by one count. Control is then returned to step 116 which determines, as before, whether all embossers have been serviced. Again, if not, the looping process continues. If they have been serviced, the steps are exited via transfer step 120. 
     If the embosser busy and card finished decision steps 115, 121 determine that an embosser is neither busy nor idle and has not just completed the embossing of a card, control is transferred to decision step 125 which determines whether an error condition exists or the down switch is on. The down switch simply indicates that the system operator has turned the embosser off. In either case, message steps 126, 127 send the appropriate message to the operator&#39;s console. Following both of the message steps 126, 127, the embosser clock is restarted by step 128. Thereafter, control is retransferred to step 116 which, as described above, determines whether all embossers have been checked. When all embossers have been checked, control is transferred to the steps of FIG. 7 for a check of pending interrupts via transfer step 120. 
     7. CRT Monitor Module 
     As described above, interrupts from one of the CRT terminal devices may be detected in the background software. When a terminal interrupt is detected, control is transferred to the CRT Processor of FIG. 4. The steps of the processor, as described above, perform certain preliminary functions prior to calling the CRT Monitor module. The CRT Monitor steps, called by step 92 of FIG. 4, are shown in FIG. 8. Accordingly, the FIG. 8 steps occur each time a character or function key is depressed on one of the CRT terminals. 
     Referring to FIG. 8, step 130 causes the one data entry to be read from the terminal. After the appropriate table entries controlled by step 131, a cursor entry decision step 132 determines whether the entry is a cursor movement command. If so, cursor movement step 133 causes the cursor to be moved as directed and for cursor pointers to be updated, after which control is returned to the steps of FIG. 7 via transfer step 134. 
     If the cursor entry decision step 132 determines the current entry is not a cursor movement command, carriage return entry decision step 135 then determines whether the entry is a carriage return command. If the entry is a carriage return, decision step 137 determines whether it is a line 5 carriage return. The significance of a fifth line carriage return is that the end of the data destined for an embossed card has been reached upon the occurrence of the five lines of data which may be embossed on a card according to this invention; further statistical data entries relating to the same attendee are simply transferred to the magnetic tape memory along with the first five lines. In those cases where the entry is determined to be a fifth line carriage return, step 138 causes the entry to be replaced with an enter code. This is done to cause the block of data destined for the embossed card to be entered at that point. If the entered character is found to be a carriage return code, but not the fifth line carriage return, or following the replacement of a fifth line carriage return code with an enter code, control is transferred to data step 140 which causes data to be inserted and pointers and the status table to be updated. Following step 140, control is retransferred to the steps of FIG. 7 via transfer step 141. 
     If the entry is found to be neither a cursor control nor a carriage return command, enter code decision step 142 determines whether the character entered is an enter command. If so, control is transferred to step 143 which controls a transfer of the data from the CRT input buffer to the selected CRT packed buffer. Also, the appropriate flags are set and pointers are updated. After the data transfer control by step 143, control is retransferred to the steps of FIG. 7 via transfer step 144. If the first three entry decision steps 132, 135, 142 determine that the current entry is neither a cursor movement command, a carriage return command nor an enter code command, the only possibility remaining is that the current entry is a data character. Accordingly, step 146 then checks to determine whether the current entry results in too many characters in the line being currently entered. If so, control is transferred to the steps of FIG. 7 via a transfer step 148. If not, first line decision step 150 determines whether the current character is in the first line to be embossed. In view of the adopted convention that no numbers may appear in the first line of an embossed card, a number decision step 151 determines if the entered character is a number. If so, the convention is violated and control is transferred to the steps of FIG. 7. If the entered character is acceptable, control is transferred to validity checking step 154 which determines whether the entered character is a valid embosser character. This check is necessary because only certain alphanumeric characters may be utilized by an embosser. The decision is made by a table look-up procedure which refers to a list of acceptable embosser entries. If the validity decision step 154 finds an invalid character, control is transferred back to the steps of FIG. 7 via transfer step 158. In such a case, the character is not displayed on the terminal screen. If, on the other hand, the validity decision step 154 finds the entered character to be a valid embosser character, control is transferred to step 160 which causes the character to be transferred to the terminal screen for display. Storage step 161 enters the valid character into the CRT input buffer, after which control is returned to the steps of FIG. 7 via a transfer step 163. 
     8. Embosser Monitor Module 
     As described in connection with the Interrupt Monitor steps of FIG. 3, the system according to this invention generates a clock interrupt every ten milliseconds. The clock interrupt causes the Interrupt Monitor to call the Embosser Processor steps of FIG. 6, which, in turn, call the Embosser Monitor software module, disclosed herein in FIGS. 9-14. 
     The basic purpose of the Embosser monitor is to supply data to the system card embossers. The data is obtained from embosser buffers located in core which were filled from CRT terminal data entries. In response to each of the ten millisecond clock interrupts, the Embosser Monitor is called to check the status of each embosser connected to the system. The status of an embosser may be either busy embossing a card, finished with a card, completely idle or in an error condition. As will be explained in connection with the flowcharts of FIGS. 9-14, the steps taken by the Embosser Monitor are determined by the status of the checked card embosser. 
     Referring to FIG. 9, the initial entry decision step 170 first determines whether or not the current entry is the first since the system was set in operation. If so, initialize step 171 sets certain embosser control words to their proper values. Thereafter, via a transfer step 172, control is returned to step 113 of FIG. 6. It should be noted at this point that throughout the figures relating to the Embosser Monitor steps, the general return is via a transfer step and is labeled EMBM RETURN. In each case, the return is made to step 113 of FIG. 6. Hereafter, the return will be simply referred to as the Embosser Monitor return. 
     In those cases where the initial entry decision step 170 finds that the current entry into the Embosser Monitor steps is not the initial entry, card clear decision step 173 determines whether the card embosser presently being looked at is in its card clear stage. This refers to the operation in an embosser following the completion of an embossed card. If the decision step 173 determines that the card clear mode is on for the embosser being serviced, further buffer decision step 174 determines whether another buffer is ready. If not, step 175, the mode of operation referred to in the software listing as Mode 4, sets up card clear waits and commands on the basis of the card clear phase number. This refers to the timing requirements of the particular embosser used. Since the cards must be physically transported through the embosser, time delays of various lengths are required in the embossing operation. In the particular embosser utilized in the preferred embodiment, the card clear module consists of eight phases. One phase is controlled each time the embosser in card clear mode is addressed. That is, after each ten millisecond embosser interrupt, each embosser in the card clear mode will be stepped through one phase. One of the steps of each phase is to set up for the next phase following the next ten millisecond interrupt. At the end of each phase in the card clear mode, the usual Embosser Monitor return is made via transfer step 176. 
     If further buffer decision step 174 determines that another buffer is ready, step 178 turns off the card clear flag at the end of the current card clear mode phase. 
     If the card clear decision step 173 determines that the embosser being serviced is not in its card clear mode, then the Embosser Monitor software will switch to one of three other modes of operation. In such a case, buffer ready decision step 180 determines whether an embosser output buffer is ready to deliver data. If not, step 181 determines if a card clear routine is necessary. If so, step 182 turns on the software card clear flag. If no card clear is found to be required by step 181 or following the card clear flag being turned on by step 182, the usual Embosser Monitor return is made via transfer step 183. 
     If the buffer ready decision step 180 finds that data is ready for delivery to an embosser from the associated buffer location, waiting decision step 185 determines whether the Embosser Monitor is currently in a waiting stage. There are a number of instances where the timing requirements of the card embosser require that certain delays be set up between controlled steps. These are requirements of the card embosser itself and will vary as different embossers are used or embosser designs are changed. For example, in the first phase of the card clear mode described above, there is a requirement that a 520 millisecond wait be made. Instead of stopping the operation of the system during this wait, the system is programmed to count successive ten millisecond interrupts until 52 have been counted. Accordingly, all of the machine timing waits are set up as multiples of ten milliseconds. The waiting decision step 185 determines whether a waiting count has been begun on a prior operation of the Embosser Monitor for the embosser being serviced. If so, control is transferred to count done decision step 186 of FIG. 13 via transfer steps 187 and 188 (FIG. 13). 
     FIG. 13 discloses the flowchart for the ECNTL routine. The purpose of the routine is to count the number of ten millisecond interrupts for the timing requirements described above. Referring to FIG. 13, count done decision step 186 determines whether the previously commanded wait period has been completed. For example, in the case of the 520 millisecond wait described above, the count done decision step 186 would generate a NO answer for 51 consecutive ten millisecond interrupts. Following a NO answer, an Embosser Monitor return is made via transfer step 190. It is pointed out that until the count is found to be finished by count done decision step 186, the Embosser Monitor routine may be exited for the embosser being serviced. 
     If the count done decision step 186 determines that the count is done, that is, that the total waiting time has elapsed, control is transferred to step 191 which clears all data lines and turns off the count flag. Thereafter, plate discharge decision step 192 determines whether the last data entered was a plate discharge command. The function of a plate discharge command is to advance all cards within the card embosser one position each time a command is entered. Note that this differs from a card clear command in that the latter advances only cards which are within the card embosser. If the plate discharge decision step 192 finds that the last data step received was a plate discharge command, control is transferred to step 194 which is the eight phase card clear mode described in connection with step 175 of FIG. 9. As before, at the end of each phase an Embosser Monitor return is made via transfer step 195. 
     If the plate discharge decision step 192 determines that the last-received data entry was not a plate discharge, step 197 calls the procedure of FIG. 14 to obtain the next data bit from the embosser buffer. The data transfer steps of FIG. 14 will be described in connection with its entry from FIG. 9. Following the transfer of the next data bit from the embossed buffer, transfer step 198 (labeled CKCTB in FIG. 13) transfers control to step 173 of FIG. 9 via control entry step 199. Thereafter, the card clear, buffer ready and waiting decisions of FIG. 9 are made as before. 
     If the waiting decision step 185 of FIG. 9 determines that the embosser being looked at is not currently in a time delay, that is, is not currently waiting, control is transferred to data decision step 200 to determine whether a next data entry should be obtained from the embosser buffer. If so, control is transferred to the software steps of FIG. 14 via transfer steps 201 and 202 (FIG. 14) for the purpose of obtaining a data entry from the embosser buffer. 
     As before, the first step in the procedure is an initial entry decision step 203 which determines whether the current data entry is the initial entry for the embosser being serviced. If so, control is transferred to step 204 for the appropriate initialization procedure. If the current data transfer is not an initial entry or, following the intial entry initialization of step 204, control is transferred to data step 205 to transfer data from the address embosser buffer. 
     When the data is obtained, identification decision step 206 determines whether the data entry is a character or a function. If a character is found, prior decision step 207 determines whether the preceding data entry was a character or a function. This decision is necessary as a different procedure is followed when, for example, a function follows a character as opposed to a character following a character on an embossed card. If the prior entry decision step 207 determines that the prior entry was a character, control is transferred to step 208 which sets the proper flags for eventual transfer via the steps of FIG. 9 to the first phase of Mode 1. (FIG. 10) If the prior entry decision step 207 finds that the previous entry was a function, control is transferred to step 210 which sets the necessary flags for later entry into the first phase of Mode 3. (FIG. 12) After each set up, control is returned via transfer steps 211 and 212 (FIG. 9) to step 213 which transfers control to the mode previously set up. 
     Returning to FIG. 14, if entry identity decision step 206 determines that the entered data is a function, control is transferred to the second prior entry decision step 215 to determine, as in the case of the first prior entry step 207, the type of entry immediately proceeding. If it is found that the prior data entry was a character, control is transferred to step 216 which sets the necessary flags for later entry into the first phase of Mode 2. (FIG. 11) If the second prior entry decision step 215 finds that the prior entry was a function, control is transferred to step 217 for setting flags for later entry into the first phase of Mode 3. (FIG. 12) After either set up, control is transferred via transfer step 218 and entry 212 (FIG. 9) to branching step 213. 
     Referring to FIG. 9, it is noted that branching step 213 may be reached one of two ways. If the embosser being serviced after the current ten millisecond clock interrupt is in the process of embossing a card, the steps of FIG. 14 are entered via data decision step 200 (FIG. 9) to obtain the next piece of data. Thereafter, branching step 213 will transfer control to one of the first three modes determined by the comparison of the present and immediate prior data entry. On the other hand, if the embosser being serviced as a result of the current ten millisecond clock interrupt is found to be in a machine timing wait sequence, control is transferred to the steps of FIG. 13 via currently waiting decision step 185 of FIG. 9. The steps of FIG. 13 set up the flags for branching into the first phase of Mode 4 by branching step 213 of FIG. 9. 
     Referring to FIG. 9, branching step 213 determines which of the four modes have been previously set up. Dependent thereon, control is transferred to the Mode 1 steps of FIG. 10 via transfer step 220, the Mode 2 steps of FIG. 11 via transfer step 211, the Mode 3 steps of FIG. 12 via the transfer step 222 or into step 223 which defines the steps of Mode 4. 
     As described in connection with step 175 of FIG. 9, the card clear mode consists of eight phases. Each ten millisecond interrupt steps through one of the eight phases. The method controlled by step 223 and step 175 of FIG. 9 is identical. 
     In those cases where the steps of FIG. 14 determine that the current data entry is a character and the prior data entry was a character, control is transferred to the steps of Mode 1. Referring to FIG. 10, the character after character mode steps are divided into two phases. Accordingly, two successive ten millisecond clock interrupts are required to complete the steps of Mode 1. When Mode 1 is first entered during each pair of entries, steps 225 and 226 transfer control to phase 1 embosser error decision step 227. If an error has been previously made by the embosser, an error flag is set by step 228 and an Embosser Monitor return made via transfer step 229. The fact of an error is later sent to the operator&#39;s console via the Master Controller module as will be discussed below. 
     If no embosser error is encountered, K-1 decision step 230 determines whether the embosser has reached a timing position referred to as the K-1 position. The K-1 position occurs when the embosser&#39;s keyboard timing shaft is in its home position. If not, an Embosser Monitor return is made via transfer step 231. If so, control is transferred to step 232 which disables all interrupts and transfers the single character of data to the embosser. Thereafter, the interrupts are enabled and step 233 sets the flags for the second phase of Mode 1 when the current card embosser is next serviced after the following ten millisecond interrupt. Thereafter, an Embosser Monitor return is made via transfer step 234. 
     When the second phase of Mode 1 is entered by branching step 226, second embosser error decision step 235 determines whether an embosser error has been made. If so, step 236 sets the error flag and an Embosser Monitor return is made via transfer step 237. 
     If no embosser error is found, position decision step 238 determines whether the embosser has advanced to a time position termed the K-89 position. When the K-89 position is reached, all embosser functions, such as head move and hammer strike, have been completed. If not, an Embosser Monitor return is made via transfer step 240. If so, a fifty millisecond wait is commanded by waiting step 241 and the count flag is turned on. As explained before, this will result in the software steps of FIG. 13 being entered for the current card embosser following the next five ten millisecond interrupts. In this way, the current machine will be allowed to pause fifty milliseconds for the embossing of the currently entered character before new data is transferred to it. Following the fifty millisecond count started by step 241, an Embosser Monitor return is made via transfer step 242. 
     Referring again to FIG. 9, it will be recalled that branching step 213 transfers control to the Mode 2 function after character steps of FIG. 11 when the current data entry is a character and the prior data entry was a function. As with Mode 1, the second mode is divided into two phases and requires, therefore, two successive ten millisecond clock interrupts to complete. 
     Referring to FIG. 11, upon the first entry, branching step 250 transfers control to the first phase embosser error decision step 251. As before, an embosser error will cause flag step 252 to turn on the embosser error flag after which an Embosser Monitor return is made via transfer step 253. If no embosser is found, time decision step 255 determines whether the embosser is in the previously described K-1 position. If not, an Embosser Monitor return is made via transfer step 256. If the K-1 position is found currently, card clear decision step 247 determines whether the card clear command is currently in force. If not, control is transferred to step 258 which disables all interrupts and initiates the function in the card embosser. Thereafter, the interrupts are enabled and step 259 controls the flags to be set up for the second phase of Mode 2. 
     Upon the next entry into the Embosser Monitor for the card embosser currently being looked at, that is, following the next ten millisecond clock interrupt, the branching step 250 will transfer control to the second phase steps. After the second phase set up is made by step 259, an Embosser Monitor return is made via transfer step 260. 
     If card clear decision step 257 determines that a card clear command is in effect, decision steps 261 and 262 determine, respectively, whether the received function is a plate discharge or a carriage return. If either, an Embosser Monitor return is made via transfer steps 263, 264. If neither are found, control is transferred to step 258 and the process continues as described above. 
     When the Embosser Monitor steps are next entered after the first phase entry, branch step 250 transfer control to the second phase embosser error step 265. If an embosser error is found, step 266 sets the proper flag after which an Embosser Monitor return is made via transfer step 267. If no embosser error is found, timing step 268 determines whether the embosser is in the previously described K-89 timing position. Since the embosser must be in that position for the second phase of Mode 2 to continue, if it is found not to be in the K-89 position, an Embosser Monitor return is made via transfer step 269. Absent an error, the K-89 timing position should be reached upon the next ten millisecond clock interrupt for the embosser being serviced. If the embosser is found to be in the K-89 position control is transferred to step 270 which begins a fifty millisecond waiting period in order to allow the entered function to be carried out by the embosser. As described above, the waiting period is determined by counting the number of intervening ten millisecond clock interrupts. After the fifty millisecond clock is started, an Embosser Monitor return is made via transfer step 271. 
     Finally, as described above in connection with FIG. 9, branching step 213 calls the software steps of FIG. 12 for Mode 3 when a function is entered following a function. Referring to FIG. 12, entries into the Mode 3 steps first require an embosser error decision step 275. As before, if an error is found, the error flag is set by step 276 and an Embosser Monitor return made via transfer step 277. If no embosser error is found, a timing decision step 278 determines whether the embosser timing is in the K-1 and K-80  position. It is necessary that the embosser be in this condition for the Mode 3 step to continue. Accordingly, if the condition is not found, an Embosser Monitor return is made via transfer step 280. 
     If the timing step 278 finds the embosser in the proper timing position, entry identity decision step 281 determines whether the entered data is a character or a function. If a character, control is transferred to step 282 which disables the interrupts and sends the data character to the embosser. Thereafter, the interrups are enabled and control transferred to counter step 283 which initiates a fifty millisecond wait as described above. Thereafter, an Embosser Monitor return is made via transfer step 284. 
     If the entry identification step 281 determines that the entry is a function, control is transferred to step 285 which determines whether card clear is in effect. If it is not, step 286 sends the entered function code to the embosser after which counter step 283 initiates a fifty millisecond wait as before. If the card clar is found to be on, control is transferred to function decision step 290 for determination of whether the entered function is a plate discharge or carriage return command. If it is, an Embosser Monitor return is made via transfer step 291. If it is not, control is transferred to step 286 which functions as previously described. 
     9. Master Controller Module 
     FIGS. 15, 16 and 17 disclose the flowcharts for the Master Controller software module. As illuatrated in the high level flowchart of FIG. 2, the Master Controller steps are entered from the last routine (FIG. 7) of the Interrupt Monitor module. Data entered at a CRT terminal is stored in core under control of the CRT Monitor portion of the Interrupt Monitor software module. Except for this data transfer, the Master Controller handles all data flow within the system. 
     There are two inputs to the Master Controller software. Data inputs originate in core buffers which contain information entered concerning each attendee. In addition, the Master Controller monitors a system status word which contains a plurality of bits, each bit showing the status of a device in the system. As will be discussed in connection with FIGS. 15-17, the Master Controller continually checks for the readiness of the system to transfer data by examining individual bits in the system status word. Finally, the Master Controller software module calls a routine for translating the data code used within the system to a special code accepted by the card embossers. This translation is, of course, dependent upon the particular card embosser used. 
     Referring to FIG. 7, it is recalled that the Interrupt Monitor, as a last step, checks for pending interrupts following the servicing of each single interrupt. When all pending interrupts at one time have been serviced, and no further interrupts are pending, the steps of FIG. 7 transfer control to the Master Controller entry steps shown in FIG. 15. 
     Referring to FIG. 15, step 300 sets the appropriate interrupt priority and transfers control to message decision step 301. Decision step 301 examines the system status word to determine whether there are any Master Controller messages, that is, whether any data is ready for transfer. If there are no messages, control is transferred to translation decision step 302 for a determination of whether there are any embosser buffers with data ready for translation to the required embosser code. If not, a disabling step 303 disables the interrupts set by step 300 and exits the Master Controller software via transfer step 304. Step 304 is labeled BGRND for Background and transfers control to step 36 of the background program steps (FIG. 2). As described in connection with FIG. 2, at this point the looping begins between the decision steps awaiting an initialization message from the operator&#39;s console or an interrupt from one of the four interrupt sources. 
     If translation decision step 302 finds that buffer data is awaiting translation, control is transferred to step 305 which turns on an appropriate bit in the system status word. Control is then transferred to message decision step 301 which will recognize the change in status word controlled by step 305. Since a Master Controller message then exists, control is transferred to embosser message decision step 307. The embosser decision step 307 determines whether an embosser buffer is ready to deliver data to a card embosser. If so, control is transferred to step 308 which sets a flag recognizable by the Embosser Monitor buffer ready decision step (step 180 of FIG. 9) so that the next time the Interrupt Monitor steps are entered, the appropriate data transfer to the card embossers will begin. Also, step 308 turns off the bit in the system status word that was examined by embosser message decision step 307 to determine whether an embosser buffer was ready to deliver data. Thereafter, control is retransferred to Master Controller message decision step 301 via transfer steps 309 and 310. 
     If embosser message decision step 307 finds no embosser buffers ready to deliver data to a card embosser, control is transferred to console message decision step 312 which looks at the status word bit concerning the operator&#39;s console. If the console has data for entry, control is transferred to the software steps of FIG. 16 for acceptance of the message via transfer step 313. 
     If console message decision step finds no console message ready for transfer, control is transferred to CRT message decision step 315 which looks at the system status word bit corresponding to the CRT data packed buffers. If any of the packed buffers are ready to deliver data to an embosser buffer, control is transferred to the steps of FIG. 17 via a transfer step 316. IF there is no CRT message, control is transferred to step 302 which, as explained above, determines whether there are embosser buffers awaiting translation. If not, the Master Controller module is exited and the background looping is begun. 
     As described above, if console message decision step 312 finds that a message is ready for entry from the operator&#39;s console, control is transferred to the steps of FIG. 16. Referring to that FIGURE, an embosser running decision step 320 determines initially whether there is a card embosser running. If so, the message ready from the operator&#39;s console will not be accepted and control is retransferred to step 301 of FIG. 15 via transfer steps 321, 310. 
     If embosser running decision step 320 finds no embosser running, command step 323 causes the command from the operator&#39;s console to be loaded into core. A command decision step 324 determines whether the entered command relates to initialization. If so, an appropriate reply message is printed on the console by step 325 and the background steps started via START STEP 326 (step 32 FIG. 2). 
     When command decision step 324 finds that the command entered from the operator&#39;s console is not an initialization command, control is transferred to step 327 which causes an appropriate reply message to be sent to the console and the instructed function to be performed. Thereafter, the status word bit relating to the Master Controller&#39;s operator&#39;s console is turned off by step 328 and control is retransferred to step 301 of FIG. 15 via transfer steps 330, 310. 
     It will be recalled that step 315 of FIG. 15 examines the bit in the system status word relating to the CRT packed buffers to determine whether any buffer is ready to transfer data. In those cases where a buffer is found ready for data transfer, control is transferred via step 316 to the steps of FIG. 17. The function of the steps of FIG. 17 is to transfer attendee information from one of the CRT packed buffers to an embosser buffer in translated form. As described above, the translation that must take place is the change in the data to a form which is acceptable by the card embossers. 
     Referring to FIG. 17, data transfer step 333 transfers data from a packed CRT buffer. Thereafter, embosser decision step 334 determines whether an embosser buffer is available for receiving the packed buffer data after its translation. If not, the FIG. 17 routine is exited through transfer step 335 to step 301 of FIG. 15. 
     If embosser buffer decision step 334 finds an available embosser buffer, control is transferred to tape writing step 336. Step 336 represents the TAPEM instructions contained in the program listing herein. The purpose of the steps is to transfer the data obtained from the packed CRT buffer to the system magnetic tape storage. As discussed above, this storage is utilized as a data source for attendee statistics. Since the tape writing steps are standard, no detailed flowchart explanation is given herein. 
     Following the transfer of the attendee data to tape, translation step 337 controls the translation of the packed data to embosser code. Step 337 operates in a familiar table look up fashion. As with the tape transfer steps, instructions for the embosser code data translation are contained herein in the program listing. Since they comprise a standard table look up procedure, a detailed flowchart explanation concerning the translation will not be made. 
     Following the translation of the data to embosser code, step 338 sets a flag denoting a full embosser buffer, notes the change in status of the now empty CRT packed buffer and turns off the Master Controller CRT message which initiated the entry into the steps of FIG. 17. Thereafter, transfer step 340 transfers control to Master Controller message decision step 301 of FIG. 15. 
     Accordingly, it is noted that the Master Controller software module, when entered, performs a looping operation until all current data transfers have been accomplished. Thereafter, via transfer step 304 of FIG. 15, the background steps are entered for the interrupt and initialization message loop. 
     10. Program Listing 
     Following is the source listing of the entire program according to this invention. ##SPC1## ##SPC2## ##SPC3## ##SPC4## ##SPC5## ##SPC6##