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Mon, 20 Jul 1998 11:16:29 -0800 |
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On 18 Jul 98 at 6:27, Neal Daskal wrote:
> My source is a IBM publication, PC and PS/2 Pocket Reference Manual
> S41G-5086-00. I quoted from it to try to answer the original question.
> Of course, it may be wrong even though it's IBM. Wouldn't be the
> first time. Also note that the value I quoted is described as the
> "Sync Freq". Could that be different from the scan frequency?
> Anyway, to add perspective I've added the values given for the
> IBM Color and Enhanced Color Displays below. I interpret "EGA/CGD"
> to mean "Enhanced Graphics Adapter set up to use the Color Graphics
> Display".
>
> >On 17 Jul 98 at 12:05, Neal Daskal wrote:
> >
> >> 5151 50/16.257khz Mono
> 5153 60/15.750khz Color
> 5154 60/15.750khz EGA/CGD
> 60/21.8khz EGA/EGD
> >
> > The PC video FAQ I found shows 18.43kHz horizontal for both MDA and
> >CGA, but I could've sworn that CGA was 14.something -- in that
> >awkward range where most men can't hear it, but most women can (and
> >find it irritating).
So over the weekend I dug out my IBM Technical Reference (revised
ed, 1984)[*], which confirms the 15.75kHz for the Color monitor (at
50 or 60 Hz) -- the web site that showed it as 18.43kHz was
apparently incorrect.
But it DOES show 18.43@50 for the Mono Display horizontal scan
frequency. It shows 16.25MHz (that's MEGA, not KILO) as the total
"throughput" for the display monitor.
[*] This edition lists three display options: Mono, CGA, and the
display in the IBM Portable PC.
I am unable to find a spec printed on my mono monitor here, or a
URL for its manufacturer.
David G
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