On 2000-10-20 [EMAIL PROTECTED] <Alejandro> said:
>Several years ago, I worked for HP in Scotland designing electronic
>circuits.
>When one board stopped working correctly after some minutes, and
>heat was suspected, we threw a comercial product that came in a
>small preasured can. This volatile liquid nearly froze any
>integrated circuit. If it was a heat problem, we could inmediately
>pinpoint which IC was the culpright.
>I think this cooling can is easily found.
It seems we've pinpointed the offending chip, and I now have a
replacement coming in a few days. A friend of mine is a fine
electrician/teacher who has had over forty years' experience with
old computers and IBM machines -- and he's especially acquainted with
the early IBM PC machines, like my PC/XT. He confirmed that Alessio's
comment about the 102 error referring to a bad timer chip was correct,
especially since nothing else showed up in our diagnostic examination.
The offending chip was the 8253 Timer chip, as indicated by the 102
system board error message of IBM's old diagnostic program.
So he suggested that I remove the old soldered chip and replace it with
a new 8253 chip along with an IC socket, which is the easiest and safest
method for a novice like me. ;-)
Believe it or not, the 8253 chip had been popular (especially with some
embedded systems) up until a few years ago and can be found at
http://www.jameco.com/, which is also a great Internet source for other
small orders of such stuff.
Jerry [o:--] "The" IBM AT/5170 model 319 [--^~---] 9600kbps/30M HD
*1986 ||||||||||||||||||||||||||||||||||||| [ =====_] 512k RAM - 8MHz
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