Patent GB-1183486-A (GB)
Title: Data Storage and Retrieval Systems
Inventor: BOBECK ANDREW HENRY
IPC: H04M1/276
Filed: 1967-05-16
Abstract: 1,183,486. Magnetic storage apparatus; repertory diallers. WESTERN ELECTRIC CO. Inc. 16 May, 1967 [16 May, 1966], No. 22651/37. Headings H3B and H4K. In a repertory dialler a memory comprises a plurality of magnetic domain wall wires in which information is written into a write portion of all the wires simultaneously but is moved along only a selected wire for read out and storage. The dialler includes a magnetic domain wall wire DW for each telephone number stored, only one being shown in Fig. 1 and seven input conductors L1 to L4 and H1 to H3 are coupled to all the domain wall wires, Fig. 2 (not shown), the depression of a a digit select button in the push-button array of a subscriber's V.F. sender, Fig. 6 (not shown), corresponding to the actuation of a coded pair of the seven conductors. Thus a telephone number is stored as a plurality of coded reverse domain pairs by pulsing two of the input conductors. The two reverse domains of the first digit are preceded by a marker reverse domain produced by pulsing conductor M by monopulser 14. Each pair of domains in a digit position are then propagated along a domain wire selected by one of the number select switches 1 to 50, Fig. 3, by propagation conductors P1 and P2K pulsed in a four phase manner by FORWARD pulse source 12, the separation between domains in a digit position remaining constant. Each coded pair is advanced seven positions in a selected domain wall wire as soon as it is stored, the domains not moving along nonselected domain wires and next succeeding domains are written into all the wires regardless of the presence of domains fron a preceding digit write operation. When the marker domain DM reaches forward position conductor 18 a current is produced therein which causes the information to cease advancing and remain in the storage position of the wire. Initially sense conductor 15 is inhibited when information is first moved from a write portion to a storage portion but normally has a pulse induced therein if a domain passes from left to write. In order to read a selected number from a selected wire the subscriber goes off-hook and depresses a number-select button corresponding to one of the switches No. 1-50 which connects the propagation conductor of the selected domain wall wire to the backward propagation pulse source 13. Information is shifted backwards until a reverse domain arrives at the backward position conductor 19 inducing a bipolar pulse pair therein, the first pulse of the pair causing the pulse source 13 to be inhibited and the propagation to cease. The second pulse of the pair causes forward pulse source 12 to be triggered and the information to be stepped from left to right. When the marker pulse DM reaches the sense conductor 15, which is now enabled, the pulse induced therein sets a seven gate converter 48 and resets a sevenstorage stepping switch 47. The next four phase propagation sequence advances the first bit of information past the sense conductor 15 and if there is no reverse domain in the position advanced past the sense conductor no pulse is induced therein and the first position of the seven gate converter 48 stores a binary zero. If the next four phase propagation sequence advances a domain past the sense conductor 15 a binary one is stored in the second position of the converter 48. When seven bits are stored in the seven positions of the converter stepping switch 47 provides a readout signal to converter 48 to provide a parallel readout. The readout process continues until the marker domain arrives at the forward position conductor 18 when the pulse induced therein results in forward pulse source 12 being inhibited and the propagation terminated.