MICROPROGRAM EXECUTION CONTROL FOR FAULT DIAGNOSIS

摘要

A microprogram execution control for fault diagnosis includes a first and a second address register. The first address register designates the microaddress of one microstep stored in a fixed memory which is designated by a diagnostic microprogram information succeeding a diagnostic program instruction from a main memory. After one microstep is executed, the first address register designates a specified microaddress in the fixed memory, and the second address register stores the microaddress of a next microstep to be executed. At a step during the succeeding diagnostic routine, the content of the second address register is stored into the main memory.