Message-Id: <200007232044.WAA13126@mailgw3.netvision.net.il>
Date: Sun, 23 Jul 2000 23:44:01 +0200
To: Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk>
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From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
CC: djgpp AT delorie DOT com
In-reply-to: <2ckmns8aetk0bh03gggf84ao27422qcpmc@4ax.com> (message from Jason
	Green on Sun, 23 Jul 2000 21:19:50 +0100)
Subject: Re: to del a window ...
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> From: Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk>
> Newsgroups: comp.os.msdos.djgpp
> Date: Sun, 23 Jul 2000 21:19:50 +0100
>
> > I think versions of COMMAND.COM from DOS 5.0 and later all honor the 
> > number of screen lines as it is known to BIOS.  If you can switch into 
> > 80x60 in a way that causes the BIOS to know you have 60 lines, 
> > COMMAND.COM will DTRT.
> 
> I have managed to switch into 80x30 and 80x60 text modes but
> unfortunately the BIOS reports these as 80x25 and 80x50.  So the
> result is a 25 or 50 line screen with a blank area at the bottom where
> the extra lines should be.

You could try poking the BIOS data area with the correct values.  The
addresses of the relevant BIOS variables are documented in RBIL.

> The Linux code knows about this BIOS bug and ignores the BIOS values
> for screen dimensions, using its own values instead.

Linux ignores BIOS, period.  In contrast, DOS functions that write to
the console device eventually call BIOS functions to produce the
character on the screen.  Thus the difference in behavior.