Variable module memory

Details Variable module memory Variable module memory

1975-12-24

1977-06-14

Thomas, James D.

Communications: electrical

Digital comparator systems

340173R, G06F 1300, G11C 900

Patent

active

040300803

ABSTRACT:
A variable module memory, particularly suitable for use in a programmable controller, includes a set of up-to-N memory modules each for storing a plurality of words of n bits. N receptacle means are provided for receiving the set of memory modules and for coupling the received memory modules to a common serial bus. Control means is provided, coupled via said receptacle means, to said up-to-N memory modules for providing address signals for selectively addressing the words of a selected memory module to provide the contents stored therein serially to said common serial bus. A pull-up resistor connecting a predetermined voltage to a common serial bus detects the absence of memory modules in the receptacles and forces the serial bus to a predetermined binary state for all bits or all words for a vacant receptacle means.

REFERENCES:
patent: 3239764 (1966-03-01), Verma
patent: 3636519 (1972-01-01), Heath
patent: 3675216 (1972-07-01), James
patent: 3760382 (1973-09-01), Itoh
patent: 3771133 (1973-11-01), Kashio
patent: 3789366 (1974-01-01), Itoh
patent: 3859640 (1975-01-01), Eberlein

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