Date: Thu, 8 Oct 92 15:48:36 GMT
From: kuku AT acds DOT physik DOT rwth-aachen DOT de (Christoph Kukulies)
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: text mode switching w/o erasure

Csaba and DJ, you both have shown up ways on how to do the mode 
switching without erasure. My problem:

I want to switch between, say 800x600 graphics mode (in a portable way -
device independent) and 80x25 text mode (to invoke the wonderful c:\dos\edit)
and switch back to graphics mode with least backing overhead (save screen
portions).
I found setmode.s in libsrc/gr/src but this sets AH=0xff  . I found
(book on VGA, Ferraro) that there is mentioned AH=0 (Set Mode) allows to
specify erasure in the highest bit of AL.

Could you be a bit more specific on how to achieve what I want to do?


--Chris