run XFree86 at 512x384

[Zhang Weiwu]

Hello. I'm running FreeBSD 5.1 on Thinkpad 600X -- my old Pentium 500MHz 
notebook with neomagic at XGA resolution.

My CPU isn't fast enough to view some divx movie in enlarged mode, but 
the movies looks bad just in a small window. I wish I can setup the 
XFree86 server to run at 512x384 resolution, which is very close to my 
movies' size. I know it can be totally impossible. I just want to try my 
luck here if someone knows right about it:)

I remember I played games at 512x384 several years ago on a PII Windows 
PC, so this seems to be a reachable resolution on some cards. However I 
don't have knowledge if my neomagic card support it, neither do I know 
where to look for the supported resolutions. Of course I can use VGA 
resolution, but VGA looks bad, because on LCD: some pixels are stretched 
to two, some stretched to three. If I can use 512x384 then every pixel 
is stretched to four, which would look better.

Do I need to add a modeline to the XF86Config? What about ModeLine 
parameters?

Besides, if 512x384 is possible, I can play NEO*GEO arcade games with 
xmame smoothly. I will love it.

Thank you.