Title: System for extending the interior decor of a microprogrammed computer

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.

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Inventors: Brioschi, Antonio (Milan, IT)

Application Number: 511135
Filing Date: 1974-10-02
Publication_date: 1976-04-06
Assignee: Honeywell Information Systems, Inc. (Phoeniz, AZ)
Primary Class(es): 712/208
Other Classes:
US Patent Ref:

3634883	Jan, 1972	Kreidermacher	340/172.
3646522	Feb, 1972	Furman	340/172.
3673575	Jun, 1972	Burton et al.	340/172.
3700873	Oct, 1972	Yhap	340/172.
3713108	Jan, 1973	Edstrom et al.	340/172.
3728690	Apr, 1973	Holtey et al.	340/172.
3768075	Oct, 1973	Reitsma et al.	340/172.

Other Refs:
Primary Examiner: Shaw, Gareth D.
Assistant Examiner: Thomas, James D.
Attorney: Holloway, Jr.; William W., Frank; David A.