Patent GB-1041998-A (GB)
Title: Improvements relating to machines for comparing response data with master data
IPC: G06F7/02
Filed: 1964-12-09
Abstract: 1,041,998. Marking exam papers. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 9, 1964 [Dec. 23, 1963], No. 50017/64. Heading G4M. The correct answers are read from a master sheet and are stored for subsequent comparison with answers read from examinees' answer sheets. Marks indicating the end of tests are also read from a control sheet and are stored to control read-out of scoring counters during or after sensing of an answer sheet. Sheets.-The master, control and answer sheets, Fig. 1 (not shown), have a pair of spaced timing marks 13 for each row. The rows are divided into two 10-position "words," each of which comprises one or more areas corresponding to a question, each area having two or more answer response positions of which one should be marked by the examinee. End of test marks are made on the control sheet in specified positions, e.g. in the eighth response position of the last word in a test part, and these marks are entered in special positions in the store. Entry of master answers.-Switch 28, Fig. 3c (not shown), is first moved to the " clear " position to close AND gate 105 in the regeneration circuit of the delay line store 107 to erase any information stored. Switch 28 is then moved to the "load" position and clock pulses are fed to the R ring counter, Fig. 3a (not shown). At R14 time AND 104, Fig. 3c, is enabled and enters a First Entry Mark on delay line 107, this mark designating one end of the storage cycle. As the master sheet is fed to the sensing station it operates switches 22, 23 to generate " timing read gate " and " read head gate " signals, Fig. 3b (not shown). The first entry mark enables AND 147, Fig. 3c, when it has left delay line 107 and has passed through regenerating triggers 122, 127, and this causes a " word mark" to be entered on delay line 107 at RA time through AND 140, trigger 144, OR 115 and AND 104. This mark indicates the next space in the store 107 to receive information and is subsequently recirculated through AND gates 149, 150. After sensing of the first timing mark by a photo-cell 20, Fig. 3a, the P ring counter is started and AND 150, Fig. 3c, is blocked to prevent recirculation of the word mark, this mark being subsequently re-inserted one word later. The first half-row or word of the master sheet is read by photo-cells 17-1 to 17-10, Fig. 3a, and buffer stores 84-1 to 84-10 are set. AND gates 91-1 to 91-10, Fig. 3b, are enabled in succession by R1 to R10, the data passing through switch 28A, AND 165 which is enabled by P1 to the delay line store 107. When the second timing mark is sensed by photo-cell 20, trigger 75 is turned off and enables buffer stores 84-11 to 84-20. Photocells 18-11 to 18-20 are displaced half a row from photo-cells 17-1 to 17-10 and are at this time in register with the second word of the first row. This word is entered in store 107 during R1-R10 and P1 of a subsequent cycle, and the rest of the master data is entered in a similar manner. Entry of control marks.-This is the same as for the master sheet except that switch 95, Fig. 3b, is moved to the other position so that the control marks are entered in store 107 from AND gates 191-193 at RB, R11 and R12 times. Comparison of answer responses with master answers.-Switch 28, Fig. 3c, is moved to the " off" position. Switches 200-202, Fig. 3d (not shown), are moved to positions corresponding to the numbers of response positions for each question in the various test parts, e.g. 5, 4 and 2 for parts I to III respectively. The first part of the answer sheet contains the Student No. and this is fed directly from gates 91-1 to 91-10 to a punching machine store over AND 304, Fig. 3b. AND 304 is blocked for the remainder of the answer sheet by the resetting of latch 302 by the first end of part control mark from store 107. This mark also sets counter 203, 204 to part I. As subsequent words are scanned, the words are gated at P1-P10 time by AND gates 255-1 to 255-10, Fig. 3e (not shown), according to the number of questions in each word. Thus, for part I having two 5-position questions per word, the two questions are gated at P1, P2, HP3-HP5 and P6, P7, HP8-HP10, the HP signals being derived from gates 244, 245 &c. Fig. 3d, and end of question signals occur at PY and PZ from OR 217. At the same time, the corresponding master answers which have been read out from store 107, and distributed to latches 254, Fig. 3f (not shown), are gated from AND 265-1 to 265-10. Comparisons are made at R1 time by AND 264 and latch 272 is set if the correct response position has been marked. Triggers 262, 277 and latch 278 detect multiple answers and, according to the position of switch 281 can cause a " wrong " answer to be scored, the answer to be ignored or the sheet rejected. At the end of each question, the EOQ signal senses the output gates 270, 274, 279 to advance the appropriate scoring counters. At the end of part I another EOP control signal is produced to advance counter 203, 204, Fig. 3d to part II and if desired, to read out the scoring counters. In part II which comprises questions having four response positions, read out signals are produced at P1, P2, HP3, HP4 and P6, P7, HP8, HP9, EOQ signals occurring at P5, P10. Similarly for part III (2 response positions) read out signals are produced at P1, P2 and HP4, HP5 and P6, P7 and HP9, HP10, EOQ signals occurring at P3. PY. P8 and PZ.