[comp.sys.atari.st] intermittent mouse - keyboard problem on old 520

pegram@uvm-gen.UUCP (pegram r) (12/12/89)

I have an old (1985, Rev B??) 520 ST.  Sometimes, after an afternoon
of "mouseing around", the keyboard and mouse stop working completely
(no response to either, programs wait quietly for input).  A reboot
effects a temporary cure, but communication between computer and
keys-mouse is rapidly lost again.  I have removed and cleaned the IKBD
processor, but it hasn't helped.  Only shutting down for a while fixes
the problem for any period of time.  I have some questions:

1) Is this a known problem?  If so,

	a) Am I correct in thinking that it is a loss of the serial
	   link between the keyboard and processor board, due to heat?

--->	b) Which end is the culprit - motherboard receiver i.c., or the 
--->	   socketed IKBD (easy to replace 8-)) processor?

	c) If the problem is heat related, can I fix it by adding a
	   heat sink of some sort? 

Email replies if possible.  Sorry to waste bandwidth if this has come up 
before.  Thanks in advance for any help.

Bob Pegram (pegram@griffin.uvm-gen.uvm.edu)