Microcomputer terminal system

Details Microcomputer terminal system Microcomputer terminal system

1979-05-18

1981-10-27

Zache, Raulfe B.

Boots, shoes, and leggings

340705, 340709, 340711, 340721, 340723, 340748, 340750, 340793, 340798, 340799, 340800, G06F 300, G06F 3153

Patent

active

RE0307858

ABSTRACT:
A microcomputer terminal system in which all input/output devices communicate with a microcomputer through a system bus. The microcomputer includes a microprocessor and a memory. Programs are stored in the memory of the microcomputer. The input/output devices include a keyboard and a cathode ray tube display. Through a read/write memory for the input/output devices interconnecting the keyboard and the cathode ray tube display with the system bus, the microprocessor, the keyboard and the cathode ray tube display perform their respective internal operations independently of the other.
The keyboard selectively produces signals representing character data and control data in a serial manner. The data, along with a strobe signal, are entered into a keyboard encoder circuit and from there into the read/write memory for the input/output devices and then to the read/write segment of the microcomputer memory. The microprocessor then writes character and control information into the video refresh segment of the read/write memory for the input/output devices for display on the cathode ray tube screen. Video circuits repeatedly read this information out of the memory for the input/output devices to determine the location of the character to be displayed on the cathode ray tube screen and to enter a composite video signal on the cathode ray tube.

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"Datanet-760 Keyboard/Display Subsystem Manual", published by General Electric, Apr. 1966, revised through Feb. 1969.

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