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From:	noLCDpanels <noLCDpanels AT anywhere DOT com>
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Subject:	Re: TSR to run 60Hz CGA at 50Hz
References:	<a45mb8$1at$1 AT newsg3 DOT svr DOT pol DOT co DOT uk>
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Date:	Sun, 10 Feb 2002 23:13:28 GMT
To:	djgpp AT delorie DOT com
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> No this post hasn't been lost for 10 years.  I have an 8-bit CGA with
> composite out that I wish to use for debugging with RHIDE/DJGPP.  I
> have fitted a b/w modulator to the card but the signal is 60Hz and my
> UK TV can't handle this.  Does anyone have a TSR or something which
> will set the output to 50Hz and keep it there ?

Is that a *real* CGA display adapter?  If so, you might be out of luck.
The display-adapters of this era (early 1980s) had a fixed set of
clock circuits, to produce all dot clocks.  If the card happens to
support a 50Hz scanrate, you might be able to set it through the CGA
BIOS.  If not, you'd probably have to desolder one of the CGA board's 
clock generators, and replace it with a different value (X * 5/6)

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