Computer and method for executing target instructions

Details Computer and method for executing target instructions Computer and method for executing target instructions

1978-10-10

1981-01-13

Atkinson, Charles E.

Boots, shoes, and leggings

G06F 922

Patent

active

042453020

ABSTRACT:
A microinstruction-controlled computer including a sequencer for controlling the sequencing of microinstructions. The computer executes target instructions by executing a number of microinstructions for each target instruction. Microinstructions are grouped in one or more microinstruction subroutines in a microstore. Microaddresses for addressing microinstructions and subroutines in the microstore are provided by a microaddress generator which includes a stack unit and other microaddress sources. The stack unit includes a stack memory and a link memory. The link memory stores, for each target instruction, a predetermined number of preloaded microaddresses where each such microaddress specifies the address of one of a number of subroutines employed to execute a particular target instruction. Sequential microaddresses in the link memory are accessed to link the subroutines employed in the execution of each target instruction.

REFERENCES:
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patent: 4131941 (1978-12-01), Siegel et al.
patent: 4131943 (1978-12-01), Shiraogawa
patent: 4145736 (1979-03-01), Yamada et al.
patent: 4156900 (1979-05-01), Gruno et al.
"Microprogramming Handbook", by Mick & Brick, Published by Advanced Micro Devices, Inc., in 1976, pp. 1-1 to 1-15, 2-2, 2-16.

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