Josh is right.
Think of it this way, if the screen really was 720x400x256 colour, then
the framebuffer would occupy over 280Kbytes. A standard VGA only allows
access to 256K (I believe).
Its really a mode-x 320x400, but the hsync and vsync frequencies
probably match the normal text mode.
Jeff
Josh McDonald wrote:
>
> Given enough coding time, slow enough horiz refresh, and
> incredibly fast IO, i could get more than 16 colours a scanline
> in textmode, but you can still only ever have 2 colours every
> 8 pixels (or 9 in normal text mode).
>
> I assure you, your monitor is just not telling you the truth, it
> _is_ unchained mode x. I'm not sure what you know about
> hardware, but monitors don't know resolution. It looks up
> the timing in a table and either a) the timings for textmode and
> modex are the same, or b) it doesn't have timing info in it's
> lookup table that match mode x, and it just defaults to that
> text mode (more likely).
>
> That and the fact that 320x200 doesn't expand nicely into
> 720x400...
>
> -Gfunk007
>
> "I like walking, but hiking is walking in areas with insects and steep
> inclines while carrying dried fruit, and I'm not down with that."
>
> :::: visit me - http://www.gfunk007.com/ :::: ICQ 74477509 ::::
>
> ----- Original Message -----
> From: "Drew Northup" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Friday, October 27, 2000 6:04 AM
> Subject: RE: Windows "splash screen" Resolution
>
> > Look guys..., I'm not sure what you know about hardware--but here are the
> > details. The actual graphics files (and the images built into io.sys) are
> > 320 by 400...., but the display algorithm (the text console built into
> > command.com) uses the native text mode as the display mode. This text
> mode
> > is 720 by 400 (by default....others are available via various hacks....).
> > This means that although the file only encodes a display space of 320 by
> 400
> > it is being either expanded, or more likely from the appearance of
> > it--interpolated, onto the text console's frame buffer space. Note this
> is
> > also, as far as I know, only explicitly the case for command.com ver 7.0
> or
> > greater. I hope that this clears things up a bit.
> >
> > Drew Northup, N1XIM
> >
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf
> > > Of Josh McDonald
> > > Sent: Thursday, October 26, 2000 3:24 AM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: Windows "splash screen" Resolution
> > >
> > >
> > > Yup, sure is.
> > > -Gfunk007
> > >
> > > "I like walking, but hiking is walking in areas with insects and steep
> > > inclines while carrying dried fruit, and I'm not down with that."
> > >
> > > :::: visit me - http://www.gfunk007.com/ :::: ICQ 74477509 ::::
> > >
> > >
> > > ----- Original Message -----
> > > From: "Nelson Rush" <[EMAIL PROTECTED]>
> > > To: "Plex86" <[EMAIL PROTECTED]>
> > > Sent: Thursday, October 26, 2000 4:38 PM
> > > Subject: RE: Windows "splash screen" Resolution
> > >
> > >
> > > > Actually, I think I know why Drew's monitor detected the wrong
> > > resolution.
> > > > 320x400 is an unchained mode x hack, right?
> > > >
> > > > Sincerely,
> > > > Nelson Rush
> > > >
> > > > "Listen... strange women lying in ponds distributing swords is no
> basis
> > > for
> > > > a system of government."
> > > > - Monty Python and the Holy Grail
> > > >
> > > >
> > >
> > >
> > >
> >
> >
