19 Dec
2007
19 Dec
'07
10:38 a.m.
On Tue, 18 Dec 2007, Dave Dunfield wrote:
Turns out many of the cards I have support a 132x25
column video mode which
is laid out exactly the same as the 80 column modes except for being 264 bytes
per line instead of 160 (character and attribute pairs).
For my ATI cards mode 35 (23h) seems to work on most of them.
IIRC, there is also a byte in BIOS data segment 40h that identifies how
many characters per line, and another for number of lines.
MANY programs are so hard-wired to expect 80 x 25 at B000h or B800h, that
they border on unusable when you have any different configuration.