Jerry,
Do you have the tools to solder stuff that small, or to unsolder the
original chip? I can solder pretty well, but haven't ever dared
soldering chips. I would end up soldering all the pins together.
Chad Fernandez
Michigan, USA
"Jerry J. Haumberger" wrote:
> 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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