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From: XWUU@PURCCVM.BITNET
Newsgroups: comp.sys.cbm
Subject: Re: Joyless Joyport
Message-ID: <91127.090919XWUU@PURCCVM.BITNET>
Date: 7 May 91 14:09:19 GMT
References: <4186@meaddata.meaddata.com>
Sender: news@mentor.cc.purdue.edu
Organization: Purdue University
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Regarding ditzy joysticks on the 64:

1. try a new joystick (this is akin to plugging in major appliances before
       calling the service rep)
2. If a new controller fails to solve the problem, it is probably the CIA #1
      chip.  It is labelled U1 on the motherboard.  From everything I have
      read and experienced, most problems of this type are due to the failure
      of this component.   Power surges and static are its worst enemies.  It
      is not socketed, so plan on adding a socket now to avoid the inevitable
      replacement hassles in the future.  Cost of a new 6526 chip is between
      $10 and $18 depending on the source.  If you wish to do the surgery
      yourself, look for the label U1 on the motherboard; the chip there should
      be labelled 6526.

3. If it is not he CIA chip, about the only other thing it could be is the 6510
      MPU.  It is labelled U7 on the motherboard.  This is very unlikely,
      however, as you probably would have been experiencing other weird stuff.

Kirk
xwuu@purccvm