22 Aug
2015
22 Aug
'15
3:36 p.m.
On 08/22/2015 02:41 PM, Jay Jaeger wrote:
Thanks. Really, such mistakes aren't too
demoralizing if
one can get the parts, get them in a reasonable amount of
time, at a reasonable price, and have the skill to do the fix
One of the biggest
oopses I ever had was I got a Memorex 10
MB hard drive with SASI controller for my S-100 /CP/M
system. I had just gotten it very roughly working, when I
was fiddling with something and the SASI controller touched
the drive and there were sparks. I did the finger test
first, and replaced all chips that were sizzling hot. Then,
I went through, looking for bad logic levels, and replaced
the chips driving those signals. Then, when I still had bad
logic levels, I replaced the chips receiving those signals.
All the time I was worred that it might have popped one or
more of the microcode ROMS. Well, after some more
replacing, it finally came back up, and the CP/M OS I had on
the drive still worked!
I guess I've had a few more cases where something went poof,
but that is one of the ones I still remember well.
Jon