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From: saulnier@cg-atla.UUCP (Jim Saulnier X7097)
Newsgroups: comp.sys.atari.8bit
Subject: Re: Stan Lackey's question about joystick I/O
Message-ID: <1060@cg-atla.UUCP>
Date: Tue, 10-Nov-87 10:16:04 EST
Article-I.D.: cg-atla.1060
Posted: Tue Nov 10 10:16:04 1987
Date-Received: Fri, 13-Nov-87 22:23:47 EST
References: <821350@RPITSMTS.BITNET>
Organization: Compugraphic Corp., Wilmington, Mass
Lines: 22
Summary: joystick I/O


	The joystick data lines are ACTIVE LOW.  If nothing is connected
	to these ports, you will read $FF from the joystick register.
	I would not advise connecting +5v to ANY of these lines. I'm
	not sure if any damage would result, but it's not a good idea
	anyway.  The Atari Hardware manual has the pinout for these
	ports.  I usually read directly from the regiter rather than
	the shadow locations.  In my 130XE, both data ports can be
	read from the same register ($D300 I think), with port 0
	being the lower nibble and port 1 the upper nibble.

	Anyway, if you want to find the data lines, connect GND to
	the different pins and read the register or shadow.
	Better yet, at your request, I will post the pinout for
	the port and requirements for reading/writing this port.


--
Jim Saulnier

...!{decvax,ima,ism780c,ulowell,cgeuro,cg-f}!cg-atla!saulnier
"Wow, it never did THAT before."