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From: Pucc-H:Physics:mal@CS-Mordred.UUCP
Newsgroups: net.micro.cbm
Subject: Re: Problems with V2 C64 and joystick
Message-ID: <1163@pur-phy.UUCP>
Date: Sun, 22-Jan-84 22:32:48 EST
Article-I.D.: pur-phy.1163
Posted: Sun Jan 22 22:32:48 1984
Date-Received: Fri, 27-Jan-84 04:38:33 EST
References: <633@security.UUCP>
Organization: Purdue University Physics Dept.
Lines: 18


     Having the same problem with a joystick in port 1, I decided to
glance at the schematic. It seems that one of the CIAs is used for both
the keyboard and port 1. As far as I can remember, they just pull in
the lines from the keyboard matrix and connect them with the lines from
port 1 as they tie them into the CIA I/O pins. One glance will probably
clarify things. As far as I can tell, yes, it's supposed to be like
that. It's just one of the shortcuts they used in squeezing out
costs.  Screwing around with it for a few minutes will prove, though,
that the junk characters are not always consistent, so this characteristic
cannot be used to simply 'GET A$' the port 1 joystick data.
     Hope this is of some help! (or perhaps reassurance)

						Mark Lucas
						Purdue Physics
						mal@pur-phy