Title: Microprogram unit for a data processor

Abstract: In a microprogram unit, an index store is provided to translate index addresses, derived from input instructions, into start addresses for microprogram routines. Thus, if microprogram routines have to be re-ordered within the microprogram store, it is only necessary to modify the contents of the index store, and further modifications to the microprogram unit, or to the input instructions, are not necessary. Start addresses may be derived in an overlapped manner, so as to increase processing speed.

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Inventors: Eaton, John Richard
Ashcroft, Derek William

Application Number: 488091
Filing Date: 1974-07-12
Publication_date: 1976-09-07
Assignee:
Primary Class(es): 712/211 712/245
Other Classes:
US Patent Ref:

3391394	Jul, 1968	Ottaway et al.	340/172.
3766532	Oct, 1973	Liebe, Jr.	340/172.
3781823	Dec, 1973	Senese	340/172.
3839705	Oct, 1974	Davis et al.	340/172.
3930236	Dec, 1975	Ferguson et al.	340/172.

Other Refs:
Primary Examiner: Shaw, Gareth D.
Assistant Examiner: Bartz, C. T.
Attorney: