Computer terminal

Details Computer terminal Computer terminal

1979-04-02

1982-07-27

Shaw, Gareth D.

Boots, shoes, and leggings

340799, G06F 932, G06F 3153

Patent

active

043420958

ABSTRACT:
A computer terminal is disclosed which may advantageously be employed as a video display terminal having editing capabilities. The terminal is a processor driven terminal having a common bus architecture. This includes a central processing unit CPU having its own internal instruction set together with facilities for operating under program control from an external memory, such as an EPROM. Data may be inputted by way of a keyboard or other peripheral, such as a host computer, for storage in a read/write external memory, such as a random access memory (RAM). When used as video display terminal data stored in the RAM may be outputted for display, as by a CRT. The terminal is constructed so that data may be fetched from the random access memory (RAM) by addressing the RAM using a program counter within the CPU, as opposed to the use of a direct memory access circuit DMA. Additionally, when used as a video display terminal, provisions have been made for controlling video display circuitry from a video control and timing circuit which provides the various timing required without the need to use a synchronizing signal generated as by a typical TV monitor circuit.

REFERENCES:
patent: 3895357 (1975-07-01), Schwartz et al.
patent: 3906453 (1975-09-01), Mattedi et al.
patent: 3911403 (1975-10-01), O'Neill
patent: 4054948 (1977-10-01), Grier et al.
patent: 4080659 (1978-03-01), Francin
patent: 4103331 (1978-07-01), Thacker
patent: 4115765 (1978-09-01), Hartke
patent: 4121283 (1978-10-01), Walker
patent: 4197590 (1980-04-01), Sukonick et al.
Motorda, M6800 Microprocessor Applications Manual, pp. 1-32,33, 1975.

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