Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!uxc!uxc.cso.uiuc.edu!m.cs.uiuc.edu!s.cs.uiuc.edu!pathak
From: pathak@s.cs.uiuc.edu
Newsgroups: comp.sys.ibm.pc
Subject: Re: Keyboard Scan Codes
Message-ID: <213400043@s.cs.uiuc.edu>
Date: 21 Apr 89 15:56:00 GMT
References: <44953@<89103>
Lines: 44
Nf-ID: #R:<89103:44953:s.cs.uiuc.edu:213400043:000:768
Nf-From: s.cs.uiuc.edu!pathak    Apr 21 10:56:00 1989


You may not have to write your own int9 routine.  If all you want is the 
status of the shift keys, control keys, alt keys .... then you can use 
a BIOS function to do the same.

int 16h	func 02h
call with:	AH = 02h

Returns in AL:

	Bit		Significance if set
	 7		Insert on
	 6		Caps lock on
	 5		Num lock on
	 4		Scroll Lock on
	 3		Alt key down
	 2		Ctrl key down
	 1		left Shift down
	 0 		right Shift down

The enhanced keyboard that came with the AT and PS/2 can be read
using:

int 16h	func 12h

call with AH = 12h

Returns in AL:

	Bit 		Significiance
	 F		SysReq down
	 E		Caps Lock down
	 D		Num Lock down
	 C		Scroll Lock down
	 B	  	right Alt
	 A		right Ctrl
 	 9		left Alt
	 8 		left Ctrl

and the rest is the same as before


Heeren Pathak
s.cs.uiuc.edu