Video display control circuit

Details Video display control circuit Video display control circuit

1993-09-02

1995-05-02

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345193, G09G 114

Patent

active

054124034

ABSTRACT:
A video display control circuit includes a reading circuit for reading address data in a video RAM pointer. The video RAM pointer designates an address in a RAM where an address data to be supplied to a character ROM pointer is stored. The character ROM pointer designates an address in a ROM where character data by which characters are displayed on a screen are stored. If the address data read from the video RAM pointer is earlier in access time than a selected address of the video RAM, into which a new address data is required to be re-written, operation of re-writing data of the video RAM is not carried out, so that flickering or momentary black-out of the display caused by the re-writing operation may not occur.

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patent: 4891788 (1990-01-01), Kreifels
patent: 4897637 (1990-01-01), Kobayashi et al.
patent: 5062081 (1991-10-01), Runaldue
patent: 5247485 (1993-09-01), Ide

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