El Tue, 8 Aug 2006 14:09:48 -0400 "Timothy Miller" <[EMAIL PROTECTED]> escribio:
> On 8/8/06, Dieter <[EMAIL PROTECTED]> wrote: > > > > Since then, I have remembered a problem with using a TV as a temporary > > console. A NTSC TV takes 720x480, but most TVs can't really resolve > > that, and 80x25 text is likely to be unreadable. IIRC, early personal > > computers that used TVs as displays only output 40 chars or so per line. > > I agree that this is a problem, but what system is going to handle > this? Probably very little since the original IBM PC will handle > 40x25. Most things are going to expect 80 columns, and few will > likely handle more than 80 either. I bet the BIOS boot screens expect > very specific properties and won't handle anything else. If we need to support this we can duplicate each line pixel or use a double width font. I do not see a big problem. IIRC EGA or CGA have a tv out and can do 80x25. > > > > I assume PAL and SECAM TVs have the same problem, just with slightly > > different numbers. > > > > Of course there are also lots of computer monitors that don't really > > resolve what they claim to. > > I think we're going to have to try to address this later, if at all. > OGD1 will be the basis for our products for a number of months, so > nothing is etched in stone (or silicon). > > What's worse about TV in general is that, with a 3.57MHz subcarrier > for color, you cannot get more than 160 columns of color on the > display (based on 640, assuming 1:1 from the viewable 480 scanlines, > with a horizontal total of 704). Moreover, although the luma is Is it possible to shift that 160 color columns from 0 to 3 pixels each 4 frames? If yes we can have 640 color columns each 4 frames. So we can have 6.25(PAL) or 7.5(NTSC) 640 color columns per second. > analog, most TVs blur the heck out of it, bringing the usable > resolution down to something between 160 and 320. So, basically, your > resolution on the display is roughly half the width of a character. > The only recourse we have is to design a really clever font, and even > then, it'll still be just about useless. ROARG, :P If it is TV fault we can correct it. I hoppe that modern TVs do it better. > We could, perhaps, implement some sort of panning, but how do you > indicate to the card the viewport? _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
