Microprocessor implemented data processing system capable of emu

Details Microprocessor implemented data processing system capable of emu Microprocessor implemented data processing system capable of emu

1989-08-04

1990-11-20

Lee, Thomas C.

Boots, shoes, and leggings

3642548, 364261, 3642632, 3642323, G06F 1500

Patent

active

049723170

ABSTRACT:
A microprocessor chip which is capable of executing a specific subset of instructions on behalf of the main storage portion of a computer memory can be made to emulate direct execution instructions not in that specific subset while working on behalf a control storage portion of the computer memory in a manner which is transparent to the main storage portion by means of a novel set of operand space selection instructions in the control storage portion and a novel switching circuit on the microprocessor chip which controls the access of the chip to the control store portion and the main store portion.

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