Communications: electrical – Digital comparator systems
Patent
1973-12-17
1976-03-02
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 1300, G06F 1306
Patent
active
039421562
ABSTRACT:
Circuits for the improved operation of microprogrammable computers are described. This improvement is accomplished by providing a set of read-only memory devices for storing the micro-code for all combinations of arithmetic logic unit function, carry bit and file register address than can be specified by an instruction word executed from Main Memory. In a universal microprogram designed to execute that family of Main Memory instructions that differ only in the functions specified above, the instruction word is used to address the read-only memory devices, the micro-code output of which is used to control the file, carry in bit and arithmetic logic unit. Through the use of these circuits a family of instructions may be executed by a single microprogram and at no increase in execution time over that required for the execution of a microprogram dedicated to a single instruction.
REFERENCES:
patent: 3117220 (1964-01-01), Wensley
patent: 3416138 (1968-12-01), Brass
patent: 3487369 (1969-12-01), King et al.
patent: 3560933 (1971-02-01), Schwartz
Disparte Charles P.
Hall Warren L.
Isaac Kenneth N.
Mock Howard C.
Cunha Robert E.
Ralabate James J.
Sachs Michael C.
Shaw Gareth D.
Weiss Franklyn C.
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