Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!seas.gwu.edu!kilian
From: kilian@seas.gwu.edu (Jens Kilian)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: "Right way" to read the joystick ports ?
Keywords: joyvec ikbws joysticks
Message-ID: <2566@sparko.gwu.edu>
Date: 18 Jan 91 14:50:47 GMT
References: <4454@skye.cs.ed.ac.uk> <6811@uqcspe.cs.uq.oz.au>
Sender: news@seas.gwu.edu
Reply-To: kilian@seas.gwu.edu (Jens Kilian)
Organization: The George Washington University, Washington, D.C.
Lines: 26

In article <6811@uqcspe.cs.uq.oz.au> warwick@batserver.cs.uq.oz.au writes:
[...]
>
>	Your routine is a parameterless procedure, and the joystick
>values are contained in some registers. I'm a bit vague on this part,
>so if nobody has any accurate data, I'll post my code.
>
[...]

The joystick routine called by the XBIOS gets a pointer to a status block
(in A0, I think). The first byte identifies the joystick that caused the
event, the second and third byte contain the current values of joysticks
0 and 1.
You should be somewhat careful about saving registers in your joystick
routine, and make it short. I usually copy the joystick values to some
global variables which are polled by the program.

	Hope this helps.

		Jens Kilian

--
\/// Internet: kilian@seas.gwu.edu     |Snail: 4715 MacArthur Blvd. \\\/
///  UUCP: ...uunet!seas.gwu.edu!kilian|       Washington, DC 20007  \\\
\\\   [These addresses will change (to kilian@cc.gatech.edu) soon]   ///
/\\\ "Wos deht ich-en so gern haage, awwer er spihrt doch nix ..."  ///\