Card reader system with improved interface

Details Card reader system with improved interface Card reader system with improved interface

1976-05-26

1977-12-27

Cook, Daryl W.

Registers

Record controlled calculators

235435, 364900, G06K 1700, G06K 700, G06F 304

Patent

active

040656624

ABSTRACT:
A card reader system providing for a plurality of card reader units to be interfaced commonly to a single central processing unit, each card reader unit having an interface assembly wholly contained within the card reader electronics package and providing for Hollerith to ASCII conversion, retransmission of card data as often as requested, and suppression of trailing zeros in the transmitted card data. Each interface assembly provides for the generation and transmission of status signals upon the occurrence of predetermined card reader conditions. Means are provided in each card reader for receiving address characters from the CPU whereby each respective card reader is selectively enabled or disenabled from communicating with the CPU depending upon whether or not it has been properly addressed.

REFERENCES:
patent: 3124674 (1964-03-01), Edwards et al.
patent: 3771135 (1973-11-01), Huettner et al.
patent: 3805245 (1974-04-01), Brooks et al.
patent: 4012720 (1977-03-01), Call et al.

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