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