Boots – shoes – and leggings
Patent
1975-11-04
1977-07-26
Shaw, Gareth D.
Boots, shoes, and leggings
G06F 916
Patent
active
040386430
ABSTRACT:
Improved means and methods for controlling the sequencing and branching of microinstructions in a microprogrammed digital data processing system. Microinstructions are stored without replication in a programmable read-only control memory and corresponding microinstruction addresses and associated test select bits are stored in a separate programmable read-only memory having an instruction address storage capacity which is a predetermined multiple of the number of microinstructions in the control memory depending upon the branching capability desired. A common address register is used for both of the control and address memories, the remaining portion of the control memory addressing being derived from testing particular system conditions selected by test select signals obtained from the address memory. The mapping of microinstruction addresses and test select bits in the multiple storage locations in the address memory are chosen in conjunction with the addressing provided by the common address register and the results of testing selected system conditions so that a significant portion of the microinstruction sequencing and branching logic normally required to perform a microroutine is instead provided by the operation of the address memory in a highly flexible and unrestricted manner.
REFERENCES:
patent: 3781823 (1973-12-01), Senese
patent: 3786434 (1974-01-01), Frye et al.
patent: 3794979 (1974-02-01), McMahon
patent: 4001788 (1977-01-01), Patterson et al.
Bartz C. T.
Burroughs Corporation
Cass Nathan
Feeney, Jr. Edward J.
Peterson Kevin R.
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