Data processing system with a microprogrammed dispatcher for wor

Details Data processing system with a microprogrammed dispatcher for wor Data processing system with a microprogrammed dispatcher for wor

1974-12-02

1976-12-14

Nusbaum, Mark E.

Communications: electrical

Digital comparator systems

G06F 1516, G06F 906

Patent

active

039978958

ABSTRACT:
A data processing system having a common data bus to which access is gained by at least a control store, an arithmetic logic unit (ALU) and an emulator unit (EMU). The control store includes a microprogrammable switch for enabling either the EMU or the ALU to process instructions received on a common bus. Common opcode bits in the instruction are interpreted by either the ALU or the EMU and responded to thereby depending upon the state of a control register in the control store. The instructions are stored in a control store array in the control store coupled with the bus, and allows operation of either the ALU (native mode of operation) or the EMU (non-native mode of operation), dependent upon the microprogram's instruction in the control store thereby giving increased efficiency of operation of the system.

REFERENCES:
patent: 3374466 (1968-03-01), Hanf et al.
patent: 3543245 (1970-11-01), Nutter
patent: 3698007 (1972-10-01), Malcolm
patent: 3721961 (1973-03-01), Edstrom
patent: 3766532 (1973-10-01), Liebel
patent: 3786430 (1974-01-01), Hajdu et al.

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