Gee, thanks, Brian! You're swell! -nt-

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: : : I've noticed that, apart from the -incabinet=1 switch, arcadeos also allows one to change the NTSC scan rates. The defaults are 105 Horizontal and 4 vertical. : : : My question is: What do these numbers mean? I've got reason to suspect that my monitor might be a little odd in its scan rates (although NTSC is a STANDARD, right?), and I want to play with these numbers in a meaningful way to test a hypothesis. Any suggestions? : : : Thanks in advance. : : The horizontal number is the number of character clocks : : in the horizontal scan : : (actuall - it's the total -5, just a quirk of VGA cards) : : Basically - : : the higher this number, the lower the hz. scanrate, : : the lower this number - the higher the hz. scanrate. : : The vertical number is the 8 least significant bits of the : : vertical line total. : : the higher this number - the lower the vertical refresh rate : : the lower this numebr - the higher the vertical refresh rate : : They're there to allow for small differences between : : VGA cards/monitors etc. : : If you think you've got a sync problem, I'd suggest : : altering the horizontal number first. : : ArcadeOS limits the range to something fairly safe, : : so you damage anything by altering it. : : The horizontal scanrate will also effect the vertical refresh rate, : : so if you lower the scanrate, each line will take : : longer to draw and the vertical refresh rate will drop. : : same thing if you up the scanrate, the refresh rate : : goes up as well : : Brian : : -----

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