Input-output apparatus for a microprocessor

Details Input-output apparatus for a microprocessor Input-output apparatus for a microprocessor

Filed on

1979-03-20

Date issued

1981-11-17

Examiner

Springborn, Harvey E.

Patent Class

Boots, shoes, and leggings

Other Related Categories

G06F 922

Type

Patent

Status

active

Patent number

043015042

Description

ABSTRACT:
A microprocessor has a first and second set of output terminals, the second set also being utilized as input terminals. A matrix is provided which has a first set of lines connected to the first set of output terminals and a second set of lines connected to the second set of output terminals. A switch-diode combination is connected at selected points of intersection of the two sets of lines. For data input, each input signal to be entered into the microprocessor is applied to close a respective one of the switches. Lines connected to the first set of terminals are then interrogated individually, by application of an "O" signal on the line. This is transferred to the corresponding one of the second set of lines only when the associated switch is closed. The so-transferred "O" signals are stored in a register in the microprocessor which is assigned to the interrogated line. For data output, all lines connected to the first set of outputs carry a "1" signal. The diodes block the "1" signals from the second set of lines and signals are transmitted from the second set of outputs to indicating instruments.

REFERENCES:
patent: 3245051 (1966-04-01), Robb
patent: 3671948 (1972-06-01), Cassen et al.
patent: 4032894 (1977-06-01), Williams
patent: 4149096 (1979-04-01), Holzner et al.
Array Logic Processing-Elliott et al.-IBM TDB, vol. 16, No. 2, 7/73, pp. 586-587.

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