Apparatus and method for receiving and servicing request signals

Details Apparatus and method for receiving and servicing request signals Apparatus and method for receiving and servicing request signals

1979-04-11

1980-12-02

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 304

Patent

active

042375355

ABSTRACT:
Peripheral devices of a microprocessor controlled system initiate service request signals which are sent to a system controller over a single dedicated request line. Such request signals are accepted by the system controller on a priority basis, with only one service request signal being honored at any given time. Once honored, the system controller addresses the peripheral device and accepts a vector request word therefrom. The vector request word is then used by the system controller to generate an index signal to select a microaddress of the microroutine to be used to service a peripheral device's request.

REFERENCES:
patent: 3685020 (1972-08-01), Meade
patent: 4059851 (1977-11-01), Nutter, Jr. et al.
patent: 4090238 (1978-05-01), Russo
patent: 4091447 (1978-05-01), Dillon et al.
patent: 4152761 (1979-05-01), Louie
patent: 4181941 (1980-01-01), Godsey

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