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From: bill@hp-pcd.UUCP (bill)
Newsgroups: net.micro.pc
Subject: Re: Help needed on Shift, control keys
Message-ID: <15200004@hpcvlo.UUCP>
Date: Mon, 18-Nov-85 12:40:00 EST
Article-I.D.: hpcvlo.15200004
Posted: Mon Nov 18 12:40:00 1985
Date-Received: Mon, 9-Dec-85 03:14:01 EST
References: <395@ihdev.UUCP>
Organization: Hewlett-Packard - Corvallis, OR
Lines: 29
Nf-ID: #R:ihdev:-39500:hpcvlo:15200004:000:831
Nf-From: hpcvlo!bill    Nov 18 09:40:00 1985


The byte you're looking for is, I believe, at 0040:0017 (hex).

Instead of directly reading this byte, however, you probably ought to
consider using Int 16h function AH=2, which returns this very byte in AL.
Int 16h functionality should be the same for PC, XT, AT, clones, etc;
the exact RAM location used (if any) may move around.

		...
		mov	ah,2
		int	16h
		...

Returns in AL the current shift status, with each bit defined as follows:
		
	INS_state	=	80h	;Insert state is active
	CAPS_state	=	40h	;Caps lock has been toggled
	NUM_state	=	20h	;Num lock has been toggled
	SCROLL_state	=	10h	;Scroll lock has been toggled
	ALT_shift	=	08h	;ALT key is depressed
	CTL_shift	=	04h	;CTRL key is depressed
	LEFT_shift	=	02h	;Left SHIFT key is depressed
	RIGHT_shift	=	01h	;Right SHIFT key is depressed

bill frolik
hp-pcd!bill