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From: ggl@mhuxi.UUCP (LASKARIS)
Newsgroups: net.micro.pc
Subject: Re: int10h help needed
Message-ID: <379@mhuxi.UUCP>
Date: Wed, 11-Dec-85 08:39:51 EST
Article-I.D.: mhuxi.379
Posted: Wed Dec 11 08:39:51 1985
Date-Received: Thu, 12-Dec-85 05:46:04 EST
References: <1216@pucc-i>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 32

> Would anyone please tell me what to expect in AL after INT 10H for MS-DOS,
> IBM PC-like machine, with 0FH in AL on entry?  Trying to get the video
> status.  For my machine it is 7 which among other things means that the
> video memory segment is at 0B000h.   Thank you.
> 
> D.K.  {decvax|harpo|ihnp4|inuxc|seismo|ucbvax}!pur-ee!pucc-i!ade

The listing of IBM BIOS in the PC `Technical Reference' (April '84) has notes
under int 10:
	(AH) = 15 CURRENT VIDEO STATE
		RETURNS THE CURRENT VIDEO STATE
		(AL) = MODE CURRENTLY SET ( SEE AH=0 FOR EXPLANATION)
		(AH) = NUMBER OF CHARACTER COLUMNS ON SCREEN
		(BH) = CURRENT ACTIVE DISPLAY PAGE
and, at AH=0, we have:
	( SET MODE (AL) CONTAINS MODE VALUE
		(AL)=0 40X25 BW (POWER ON DEFAULT)
		(AL)=1 40X25 COLOR
		(AL)=2  80X25 BW
		(AL)=3  80X25 COLOR
		GRAPHICS MODES
		(AL)=4  320X200 COLOR
		(AL)=5  320X200 BW
		(AL)=6  640X200 BW
		CRT MODE=7 80X25 B&W CARD (USED INTERNAL TO VIDEO ONLY)
		*** NOTE BW MODES OPERATE SAME AS COLOR MODES, BUT
		         COLOR BURST IS NOT ENABLED

Hope this helps.

David Laurance
mhuxi!ggl