Vesa Programming In Assembler

vizskywalker

Jan 13 2005, 02:23 AM

I started working in assembler about a year ago. Several months ago I attempted to use SVGA graphics mode. However, when I use the VESA standards I run into a problem where the refresh rate that the program sets with a mode is outside the operating parameters of the monitor. Does anyone know of any sites that explain how to solve this problem, or can anyone explain it themself? Thanks.

osknockout

Jan 21 2005, 10:37 PM

I haven't programmed for VESA in years,
but I think you can still manually change the
refresh rate. Could you tell what environment
you're using?

vizskywalker

Jan 23 2005, 05:39 AM

Yeah, thanks, it's windows (xp and 98), pentium 1 through 4, and VESA 1.0 to 3.0. I'm trying to use gtf timings to generate the pixel clock I need, but they don't make the fomula public, and I know it's been done, so i was wondering if anyone here might know them or an alternate method. Thank you so much.

osknockout

Feb 2 2005, 02:00 AM

Sorry for the long time...
I was busy with some other stuff.

Ah pixel clock...
there are a bunch of more methods, see
http://my.execpc.com/~geezer/osd/graphics/

Yes, you are right, they didn't release it out.
But, there is a way, Xfree86:
http://www-uxsup.csx.cam.ac.uk/redhat/howt...o-Timings-HOWTO
goto section 6.3 - yes hack xfree86 source

vizskywalker

Feb 2 2005, 09:49 PM

That's okay, but it appears as if the pixel clock method not specific to Xfree86 doesn't have a way to take a refresh rate and get a pixel clock yet, and the Xfree86 page is specific to Xfree86, and I'm working on Windows XP. If you know of any other sites that can help generate the pixel clock or have methods for a CRT Controller I would appreciate it. Thanks for your help.

osknockout

Feb 5 2005, 11:54 AM

Sorry, I don't know that much asm

best of luck though, and if you think
of starting to hack XFree86 code, contact
the Delphi&Asm forum when you have
problems.

vizskywalker

Feb 6 2005, 12:28 AM

Thanks anyway.

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