Title: Control store system and method for storing selectively microinstructions and scratchpad information

Abstract: A system and method for providing a control store arrangement in which a single memory having a plurality of memory locations can be used for storing sequences of microinstructions or scratch pad information. The number of storage locations defining the scratch pad area can be increased or decreased as required by assigning tag addresses to a desired number of scratch pad storage locations when the microinstruction routines are being assembled. In this manner, the locations defining the scratch pad areas can be tailored to the particular system operation to be performed. This eliminates the need for modifying the control store circuits to change the size of the control store scratch pad area.

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Inventors: Taylor, Donald R. (Framingham, MA, US)
Parmet, Arthur A. (Waltham, MA, US)

Application Number: 644777
Filing Date: 1975-12-29
Publication_date: 1978-04-11
Assignee: Honeywell Information Systems Inc. (Waltham, MA)
Primary Class(es): 712/248
Other Classes:
US Patent Ref:

3293610	Dec, 1966	Epperson et al.	364/200.
3380025	Apr, 1968	Ragland	340/172.
3391394	Jul, 1968	Ottaway et al.	340/172.
3434112	Mar, 1969	Yen	340/172.
3560933	Feb, 1971	Schwartz	340/172.
3646522	Feb, 1972	Furman et al.	340/172.
3828320	Aug, 1974	Dinerman et al.	340/172.
3859636	Jan, 1975	Cook	340/172.
3872447	Mar, 1975	Tessera et al.	340/172.
3900835	Aug, 1975	Bell et al.	340/172.
3911406	Oct, 1975	McLaughlin et al.	340/172.
3914747	Oct, 1975	Barnes et al.	340/172.

Other Refs:
Primary Examiner: Chapnick, Melvin B.
Assistant Examiner:
Attorney: Driscoll; Faith F., Prasinos; Nicholas, Reiling; Ronald T.