Video display system using memory with parallel and serial acces

Details Video display system using memory with parallel and serial acces Video display system using memory with parallel and serial acces

1983-12-30

1987-01-27

Heckler, Thomas M.

Boots, shoes, and leggings

340750, 365189, G09G 102

Patent

active

046398902

ABSTRACT:
In a computer system, an improved memory circuit is provided for accomodating video display circuits with CRT screens having different resolutions. The memory circuit includes a bit-mapped RAM unit or chip having sufficient cells to accomodate any CRT screen intended to be used, and it further includes a serial shift register having a plurality of taps at locations corresponding to different preselected columns of cells in the chip. In the system, provision is included for selecting taps to unload only the portion of the shift register containing the bits of interest, whereby unused portions of the chip may be effectively excluded and the time for transferring data of interest to the CRT screen is reduced.

REFERENCES:
patent: 3577086 (1971-05-01), Kliman et al.
patent: 3930239 (1975-12-01), Salters et al.
patent: 4498155 (1985-02-01), Mohan Rao
patent: 4541075 (1985-09-01), Dill et al.
patent: 4562435 (1985-12-01), McDonough et al.

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