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From: cdold@starfish.Convergent.COM (Clarence Dold)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Info on Controlling Joy Sticks
Summary: INT 15 - Joystick Support
Keywords: joy stick, game controller
Message-ID: <712@starfish.Convergent.COM>
Date: 13 Sep 88 17:14:39 GMT
References: <637@dinl.mmc.UUCP>
Organization: Convergent Technologies, San Jose, CA
Lines: 24

In article <637@dinl.mmc.UUCP>, noren@dinl.uucp (Charles Noren) writes:
> direction on how to read joy stick values on a PC in C or assembly?

INT 15H, AH=84H - Joystick Support
Input	AH	=84H
	DX	=0000H	Read Switches
		=0001H	Read Potentiometer
	
Returns	AX	=Switch settings, if DX=0000H
		 POT A(x), if DX=0001H
	BX	=POT A(y), if DX=0001H
	CX	=POT B(x), if DX=0001H
	DX	=POT B(y), if DX=0001H
	CF	=0
	IF	=1

The Joystick that I bought claims that the 'pot' values read will vary with
the speed of the machine.  You should assign a value for 0,0 to the pot
reading at entry, or at a specific 'recalibration' time.

-- 
Clarence A Dold - cdold@starfish.Convergent.COM		(408) 435-5274
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		P.O.Box 6685, San Jose, CA 95150-6685