Computer system having mixed macrocode and microcode instruction execution.

摘要

A computer system uses microcode subroutines to execute complex macroinstruction. Each macroinstruction is used to index a table (18). Simple macroinstructions have a single microinstruction counterpart in the table (18), and such microinstruction is performed directly in order to execute that macroinstruction. The table entry corresponding to more complex macroinstructions is a jump microinstruction, with the target of the microcode jump being an appropriate subroutine in microcode memory (16).