Computer acquisition of data from nonaddressable switches

Details Computer acquisition of data from nonaddressable switches Computer acquisition of data from nonaddressable switches

1980-01-29

1982-09-07

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082589, H04Q 900, G08C 900

Patent

active

043486703

ABSTRACT:
In a computer system in which address lines and data lines are utilized to interface bus devices to the computer, data is provided to the computer from nonaddressable switches by connecting at least a portion of the data lines to ground through a pull-down resistor and to a positive voltage through a switch and a pull-up resistor. Depending upon the position of the switches associated with each data line, each data line will be pulled to a high logic level or a low logic level when the data lines are in the tristate high impedance mode. The computer can read the contents of the switches even though the switches have no associated address decoding or bus driving circuitry.

REFERENCES:
patent: 4106011 (1978-08-01), Melanson et al.
patent: 4188626 (1980-02-01), Frantz et al.
patent: 4189719 (1980-02-01), Massa et al.
patent: 4231016 (1980-10-01), Ueda

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