System for extending the interior decor of a microprogrammed com

Details System for extending the interior decor of a microprogrammed com System for extending the interior decor of a microprogrammed com

1974-10-02

1976-04-06

Shaw, Gareth D.

Communications: electrical

Digital comparator systems

G06F 916, G06F 1300

Patent

active

039493725

ABSTRACT:
The system discriminates between "allowed" and "forbidden" machine instructions by interpreting coded digital words found in an auxiliary memory. "Allowed" instructions found in the microprogramming memory are directly executed. "Forbidden" instructions lead to the execution of exception routines, which determine if the instruction is an "additional" instruction which has a microprogram for its execution in working memory. If so, working memory is accessed and the machine instruction is executed.

REFERENCES:
patent: 3634883 (1972-01-01), Kreidermacher
patent: 3646522 (1972-02-01), Furman
patent: 3673575 (1972-06-01), Burton et al.
patent: 3700873 (1972-10-01), Yhap
patent: 3713108 (1973-01-01), Edstrom et al.
patent: 3728690 (1973-04-01), Holtey et al.
patent: 3768075 (1973-10-01), Reitsma et al.

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