Browse Prior Art Database

High Flexibility Programmable Raster for Video

IP.com Disclosure Number: IPCOM000052705D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Moreau, R: AUTHOR

Abstract

This invention relates to the use of a read-only memory (ROM) 1 to provide the signals necessary to drive a display device 2.

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High Flexibility Programmable Raster for Video

This invention relates to the use of a read-only memory (ROM) 1 to provide the signals necessary to drive a display device 2.

ROM 1, which can be a PROM (programmable read-only memory) or a REPROM (reprogrammable read-only memory), is addressed by a free-running counter 3 which is incremented by a clock signal. Each addressed location of ROM 1 provides a word containing the bit signals controlling the display device 2, that is, the vertical synchronizing, horizontal synchronizing and blanking signals. An additional bit signal representing the above signals mixed may be used to drive a TV monitor 4.

With such a system it is only necessary to change the contents of the ROM 1 or, more simply, to replace the memory itself should the display device be replaced by another one having different standards.

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