Input/output subsystem using card reader-peripheral controller

摘要

An input/output subsystem for controlling data transfer between a peripheral device, such as a card reader-peripheral unit and a main host computer. The subsystem includes: a base module which supports one or more peripheral-controllers (card reader-data link processors) which receive and process data from card readers and store them in a buffer memory for later transmittal to the host system; a Distribution control circuit which selectively connects and disconnects a data link processor to the host system; a maintenance card means for testing and checking the functioning of the data link processors.