Microprogram controller for controlling readout of a microprogram stored in multiple storage areas

摘要

Connecting an address register and a read register to each of a main control storage and an external control storage to transfer an output from the read register of the external control storage to the read register of the main control storage, and providing a branching determination circuit for making branching determination of conditional branching instructions from the main control storage and the external control storage and a branching determination synchronization circuit for, when the conditional branching instruction comes from the external control storage, executing the conditional branching instruction and the synchronization between the main control storage and the external control storage, to execute the microprogram and conditional branching instructions by the output of the read register of the main control storage.