Data processor executing microprograms according to a plurality

Details Data processor executing microprograms according to a plurality Data processor executing microprograms according to a plurality

1985-04-23

1987-09-01

Heckler, Thomas M.

Boots, shoes, and leggings

G06F 922

Patent

active

046912789

ABSTRACT:
A data processor controlled by microprograms which can run a desired program in a selected one of multiple system architectural modes. In the data processor, the operation code of the instruction is used as an address for a decoding information storage which stores a plurality of pairs of a microinstruction start address and an editing format control word. A selector selects a pair of a start microinstruction address and an editing format control word. The microinstruction start address is used for accessing a microcode control storage storing a plurality of microprograms in microinstruction form. The editing format control is used as an editing designation signal for editing the operand of the instruction according to the selected mode.

REFERENCES:
patent: 4077058 (1978-02-01), Appell et al.
patent: 4205371 (1980-05-01), Feather
patent: 4456954 (1984-06-01), Bullions, III et al.
patent: 4467409 (1984-08-01), Potash et al.

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