Système pour le traitement d'informations

854,159. Checking arrangements for magnetic data-storage apparatus. STANDARD TELEPHONES & CABLES Ltd. Sept. 12, 1958 [Sept. 19, 1957], No. 29260/58. Class 106 (1). [Also in Group XVI] A typewriter or accounting machine 18 transmits pulse-shaped information which is stored and also recorded in a magnetic tape 4, the record in the tape being read after each line and checked against the information on the store. The information is grouped in predetermined maximum number of characters and recorded on a definite length of the magnetic tape 4 by a writing-reading head which is mechanically moved forwardly and backwardly so that characters recorded are read and compared with the input information recorded in the store: only in the absence of errors is the magnetic tape advanced automatically by the definite length. This length is identified by photo-electric sensing device 8 reading transparent marks attached to the tape, and the tape is advanced one line-length at a time but during writing and reading the tape remains unmoved. Alternatively, when shorter linelengths are to be recorded character counting means may be provided. The information typed is first passed through a code connector 21 and then stored in either of two flip-flop register, temporary storage devices 19, 20 which are alternately in use. A further storage device 22 serves the writing in of fixed data. The storage devices are connected to a mixing device 23 which reads and counts the words contained in the store 22 and transfers them to the magnetic head of the recording device 1. After the information is recorded the head returns and makes a second travel to read the just recorded information and this is entered in a comparator 35 comprising diodes 36 and transistor 37, Fig. 4. If the information from the magnetic head is different from that coming from the mixing device 23, the latter communicates its information again to the magnetic head which, in turn, registers the information, reads it again, and again routes it to the comparator 35. An alarm is given if there is still no comparison.