Re: [XFree86] X configuration for a 25Khz arcade monitor
On Tue, 18 Nov 2003, MEGHAZI FABIEN wrote: > Hi all, > > I would like to set up my own mame arcade cabinet, I saw that > lot of people use AdvanceMame that programs good frequencies > directly to the video card, but I don't want to use AdvanceMenu, > I want to code my own menu using SDL under X. But as I don't know > very much about this, I would like to know if it is possible to > write a modeline for X so it will use a 640x480 resolution using > a 25Khz horizontal frequency and a 60Hz Vertical frequency. > And if it's possible, do I need to get a special gfx card, or > is there a chance it will work on my old Nvidia Riva TNT 2 ? > > > Here are the specification of my monitor : > > MEDIUM RESOLUTION > > HORIZONTALVERTICAL > Scan Frequency: 25.00 KHzScan Frequency: 60.0 Hz >Scan Period: 40.0 µSec Scan Period: 16.7 mSec > Active Video: 32.0 µSec Active Video: 15.4 mSec >Video Delay: 7.2 µSec Video Delay: 1.2 mSec 115 clocks. 30 scanlines. > Sync Pulse: 4.0 µSecSync Pulse: 0.2 mSec 64 clocks. 5 scanlines. > Scan Line: 640 Pixels Screen: 416 Lines htotal vtotal > Resolution: 512 Pixels Resolution: 384 Lines hdisplay vdisplay > Clock Freq: 16.00 MHz That's 512x384 not 640x480 # 512x384 @ 60.00 Hz hsync: 25.00 kHz; pclk: 16.00 MHz Modeline "512x384" 16.00 512 525 589 640 384 386 391 416 -HSync +VSync Yes, a TNT2 should be able to generate that. You might need to play with +/- HSync, VSync depending on how picky the monitor is. Mark. ___ XFree86 mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xfree86
Re: [XFree86] X configuration for a 25Khz arcade monitor
You might study http://en.tldp.org/HOWTO/XFree86-Video-Timings-HOWTO/ It has most of the details. The refresh is (dot clock Hz)/(total x * total y) and the scan is dot clock Hz)/(total x --the largest number in the x part of the modeline) There may be limitations on the graphic card and the monitor, of course. Regards, Paul Nielsen [EMAIL PROTECTED] wrote: I've played around with the modeline generator at http://xtiming.sourceforge.net/cgi-bin/xtiming.pl, but I haven't been able to come up with a modeline at exactly 25KHz. Simplest I could get away with was somewhere between 30 and 31KHz. I have my doubts whether you can run resolutions that high *cough* at a frequency that low. I still have a question about this (a silly one because I don't know much about technical details related to video frenquencies) Why isn't it possible to run this resolution at a lower frequency and why isn't possible to run a lower resolution (eg 256x224) at a higher frequency (25Khz) ? Where is the limitation ? In the graphics cards or is it simply the way frequencies should work ? If the limitation is about graphic card, does exists some special cards which allows to do such things ? PS: sorry for these newbie questions, but I previously googled a lot on this subject and found nothing, i'm deseperated :) ___ XFree86 mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xfree86
RE: [XFree86] X configuration for a 25Khz arcade monitor
> I've played around with the modeline generator at > http://xtiming.sourceforge.net/cgi-bin/xtiming.pl, but I haven't > been able to come up with a modeline at exactly 25KHz. Simplest > I could get away with was somewhere between 30 and 31KHz. I > have my doubts whether you can run resolutions that high *cough* > at a frequency that low. I still have a question about this (a silly one because I don't know much about technical details related to video frenquencies) Why isn't it possible to run this resolution at a lower frequency and why isn't possible to run a lower resolution (eg 256x224) at a higher frequency (25Khz) ? Where is the limitation ? In the graphics cards or is it simply the way frequencies should work ? If the limitation is about graphic card, does exists some special cards which allows to do such things ? PS: sorry for these newbie questions, but I previously googled a lot on this subject and found nothing, i'm deseperated :) ___ XFree86 mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xfree86
Re: [XFree86] X configuration for a 25Khz arcade monitor
On Tue, Nov 18, 2003 at 02:57:04PM +0100, MEGHAZI FABIEN wrote: > > I've played around with the modeline generator at > > http://xtiming.sourceforge.net/cgi-bin/xtiming.pl, but I haven't > > been able to come up with a modeline at exactly 25KHz. Simplest > > I could get away with was somewhere between 30 and 31KHz. I > > have my doubts whether you can run resolutions that high *cough* > > at a frequency that low. Would you consider a (slightly?) lower > > resolution for your SDL program? > > Thanks for the link ! I previously found a modeline generator but it > was not as usefull as this one. > > Well I guess I'd better use the resolution this monitor was built for > (512x384) and I'll try this modeline: > > Modeline "[EMAIL PROTECTED]" 15.38 512 544 600 632 384 392 396 404 Sounds good to me. From what I remember, my old TNT chipset had no problems with a dot clock of 15.38. My new Radeon 9000 card however would not accept anything below 20. Perhaps something to keep in mind. If you can test the card you wish to use before connecting it to the Arcade monitor (dot clock range is printed in the logfile) you might be able to prevent some problems. Regards, Pieter Hulshoff ___ XFree86 mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xfree86
Re: [XFree86] X configuration for a 25Khz arcade monitor
> I've played around with the modeline generator at > http://xtiming.sourceforge.net/cgi-bin/xtiming.pl, but I haven't > been able to come up with a modeline at exactly 25KHz. Simplest > I could get away with was somewhere between 30 and 31KHz. I > have my doubts whether you can run resolutions that high *cough* > at a frequency that low. Would you consider a (slightly?) lower > resolution for your SDL program? Thanks for the link ! I previously found a modeline generator but it was not as usefull as this one. Well I guess I'd better use the resolution this monitor was built for (512x384) and I'll try this modeline: Modeline "[EMAIL PROTECTED]" 15.38 512 544 600 632 384 392 396 404 Thanks again ! ___ XFree86 mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xfree86
Re: [XFree86] X configuration for a 25Khz arcade monitor
> very much about this, I would like to know if it is possible to > write a modeline for X so it will use a 640x480 resolution using > a 25Khz horizontal frequency and a 60Hz Vertical frequency. I've played around with the modeline generator at http://xtiming.sourceforge.net/cgi-bin/xtiming.pl, but I haven't been able to come up with a modeline at exactly 25KHz. Simplest I could get away with was somewhere between 30 and 31KHz. I have my doubts whether you can run resolutions that high *cough* at a frequency that low. Would you consider a (slightly?) lower resolution for your SDL program? Regards, Pieter Hulshoff ___ XFree86 mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xfree86
[XFree86] X configuration for a 25Khz arcade monitor
Hi all, I would like to set up my own mame arcade cabinet, I saw that lot of people use AdvanceMame that programs good frequencies directly to the video card, but I don't want to use AdvanceMenu, I want to code my own menu using SDL under X. But as I don't know very much about this, I would like to know if it is possible to write a modeline for X so it will use a 640x480 resolution using a 25Khz horizontal frequency and a 60Hz Vertical frequency. And if it's possible, do I need to get a special gfx card, or is there a chance it will work on my old Nvidia Riva TNT 2 ? Here are the specification of my monitor : MEDIUM RESOLUTION HORIZONTALVERTICAL Scan Frequency: 25.00 KHzScan Frequency: 60.0 Hz Scan Period: 40.0 µSec Scan Period: 16.7 mSec Active Video: 32.0 µSec Active Video: 15.4 mSec Video Delay: 7.2 µSec Video Delay: 1.2 mSec Sync Pulse: 4.0 µSecSync Pulse: 0.2 mSec Scan Line: 640 Pixels Screen: 416 Lines Resolution: 512 Pixels Resolution: 384 Lines Clock Freq: 16.00 MHz Thanks in advance for your response, this list is my last hope to get my cabinet working ! :)) ___ XFree86 mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xfree86
