-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 James Richard Tyrer wrote: > Timothy Miller wrote: >> On 8/9/06, James Richard Tyrer <[EMAIL PROTECTED]> wrote: >> >>> >>> Well that is another issue isn't it. VGA is based on NTSC. >>> How is it displayed on PAL? >> >> Do we care? We'll just put out a valid PAL mode and use 400 of >> the scanlines (interlaced) for the image. >> > That will certainly work for the character mode boot. My comment > was a bit OT. > > But, I was wondering about the general issue. If a user tries to > display VGA on a PAL TV set, what happens. Scan conversion would > fix the problem but IIUC we aren't going to use hardware scan > conversion. This would be another advantage of trying to leverage > existing hardware. > > Obviously, it would be best if the user chose a pixel format (768 x > 576) that was suitable for PAL display. > > I also wonder (I do that and > 90% of the time it goes nowhere, but > occasionally I come up with something) if PAL TV sets will run at > 60 Hz vertical field rate? If so, they would probably be able to > display VGA since the horizontal (interlaced) scan rates are about > the same (15625 vs. 15750). > There is a special PAL @60Hz mode. Newer TV's doit. Older ones don't tend to. Not sure exactly what the market was for. Probably for easier playback of NTSC video tapes recorded at 60Hz so the player only had to convert the signals & not the framerate as well.
H -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFE2wU3/3QXwQQkZYwRAjW8AKDFcCwZUq1KAVIZDYpef2aN7V1u2wCeMvHM hjzGsnqWHxTLUnqEzQSeXBc= =Kvey -----END PGP SIGNATURE----- _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
