Force 15Hz during PC boot

[bimm25e]

So I have already popped a K7000 sending a video signal that was too high and I am really nervous about breaking another. 

My damn computer wont keep the 15Hz setting during bootup and sometimes when I close Hyperspin the computer gets confused and changes from 640X480 to 800x600.

I am using Soft15khz and an ATI graphics card runing catalyst 9.2.

I would like to know a way so the computer will only EVER user 640x480 (30hz interlaced)

[Minwah]

I think you may have a similar problem to me:

http://forum.arcadecontrols.com/index.php/topic,135336.0.html

Try using Quickres to set your resolution to a non-interlaced mode (eg 640x288) - it if's anything like mine then it will boot into that, whereas I cannot boot into the interlaced modes.

That said the Post stuff (before Windows boots) will be in 31khz whatever you do, as Soft15khz obviously only works in Windows. One solution is to use a hardware timer to delay switching the monitor on until Windows has booted.