Communications: electrical – Digital comparator systems
Patent
1974-12-24
1976-07-27
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 918
Patent
active
039720292
ABSTRACT:
A microprogrammed control for a controller operates with an instruction set which includes a pair of microinstructions, each having an op code field. One of the microinstructions has an op code field coded to specify a load constant operation in which a constant field of the microinstruction is loaded into an auxiliary register coupled to the control store of the microprogrammed control. The other microinstruction has an op code field coded to specify an unconditional return branch operation to a location specified by the contents of the auxiliary register loaded previously. Pairs of these microinstructions arranged in a predetermined sequence are included within each routine of microinstructions stored in the control store which the controller is required to execute in parallel. During operation, each microprogram routine in response to a first one of the microinstructions branches to the other routine at the location specified by the previously loaded contents of the auxiliary register concurrent with loading the auxiliary register with a constant corresponding to a return location with the same microprogram routine. Inclusion of the same sequence of microinstructions in different portions of each microprogram routine causes the control store to alternate between the routines to points specified by the contents of the auxiliary register. The arrangement thereby enables the sharing of the microprogram control between two independently operating microprogram routines.
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Chapnick Melvin B.
Driscoll Faith F.
Honeywell Information Systems Inc.
Prasinos Nicholas
Reiling Ronald T.
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