Interface system for a computer terminal and random access slide

Details Interface system for a computer terminal and random access slide Interface system for a computer terminal and random access slide

1975-09-17

1977-05-03

Zache, Raulfe B.

Communications: electrical

Digital comparator systems

G06F 100

Patent

active

040217850

ABSTRACT:
An interface system for a PLATO IV computer terminal and random access slide projector that permits use of standard slides. The terminal keyboard selects a slide number which causes a strobe signal and binary signal representing the number to be transmitted to the interface. The number is latched in the interface upon reception of the strobe and then fed to a programmable read only memory (PROM) where the binary signal is algorithmically converted into a base 9 system. The output of the PROM is fed to decoders which convert the base 9 numbers into high and low order signals and are then fed to the slide projector after passing through inverter drivers and protective diodes. The interface also controls the ON/OFF position of the projector and generates an access signal to the projector after it has received the slide number in proper form.

REFERENCES:
patent: 3566370 (1971-02-01), Worthington
patent: 3585597 (1971-06-01), Holmerud
patent: 3596253 (1971-07-01), Ruth et al.
patent: 3753240 (1973-08-01), Merwin

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