Improved microprogrammed peripheral processing system

摘要

A microprogrammed peripheral processor includes a read only memory store containing a plurality of microprograms and two way branching apparatus in addition to return address register storage. Additionally, the peripheral processor includes apparatus for storing one or more control bytes of information. These bytes include a read/write director byte coded to specify operations to be performed by different work microprogram routines being executed by the processor for the type of command specified. The coding of this control byte is initially specified by the particular command code designating the type of operation the processor is to execute. During the execution of the command, the processor establishes communication between director routines and execution routines by referencing the director byte and the return register storage.