Author: Gwile (217.112.237.100)
Date: 06-04-2003 11:43
Hi Strider !
> Is it possible to know the vertical refresh
> rate of a screen (in Hertz) on a Falcon?
> Maybe using the video registers from
> $FFFF82A0 to $FFFF82C2?
It seems possible (according to the end of the superb "The Authoritative Guide To The Falcon Video Hardware\",available here: http://mikro.local.sk/Memory Maps/FALVIDEO.TXT) if you know the value of VFT, HHT, and the VIDEL video clock frequency . The last one is tricky because it depends if the VIDEL was accelerated in some way so you will have to test for accelerator boards and such...
> By the way, who can tell me how to force a
> VGA screen to 50 Hz please?
Well, simply design a 50 Hz resolution with Screenpain! If you want to force a given resolution to 50 Hz, in the general case it should be possible if the original frequency was higher: you must recalculate VIDEL register values according to the infos given in the doc quoted.
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