Circuit for detection of co-processor unit presence and for corr

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3642286, 3642292, 3642802, 36493149, C06F 1516

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active

055903630

ABSTRACT:
A digital computer system includes a central processor unit (CPU) and an optional co-processor unit, both connected to a local bus. The co-processor unit, when installed, fits into a socket having pins, the pins being connected to communicate with the CPU through the local bus. A presence-detect circuit is connected to the local bus and receives a signal indicating the presence of the co-processor unit in the socket. Logic circuitry receives the output signal from the presence-detect circuit and provides a READY-- signal in either the presence or absence of the co-processor unit.

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patent: 4979102 (1990-12-01), Tokuume
Short, Kenneth L. "Microprocessors and Programmed Logic", 2nd edition, .COPYRGT.1987, 1981. Prentice Hall, Inc. QA 76.5, s496. ISBN 0-13-580606-2 025.
LAPX 286 Hardware Reference Manual, Intel Corporation, 1983 pp. 6.1-6.8.

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