X386 - Tseng Labs ET4000-based video card question
Thomas Roell
roell at informatik.tu-muenchen.de
Fri May 31 17:24:15 AEST 1991
> 25.175 28.322 36.000 40.000 44.900 62.000
>However, "clock ET4000" tells me that they are:
> 25.2 28.3 32.5 36.0 40.0 44.9 55.6 64.4
>
>I do not have a lot of faith in the manual because it is so poorly written
>but it seems like numbers would be hard for them to get wrong. Any comments
>or suggestions?
I would rather trust clock.exe. clock.exe just programms the videochip for
a common display mode, and the counts the time needed a horizontal frame.
Every number counted is compared to the wellknown of the 28.322 quartz.
But throught the limiation of this method only about 3 numbers are sigificant.
At higher quartzes there may be even higher errors +- 0.5. But clock.exe
definitively shows all frequencies available.
- Thomas
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