PDP 11/45 partial success.
wacarder at usit.net
Fri Mar 18 15:53:44 CST 2005
Mike Cesari said:
> If that fast spike looks like:
> 5v _|___|____
> | |
> | |
> 0v ________
> ... or similar, this can (will) cause intermittent problems when you
> load the system
> with usage like installation, compiles, etc. Especially when the spikes
> bottom out at
> less than 2.5v. We saw this cause very "odd" system crashes on 11/70's.
> Components on
> the h744 regulators started to degrade, `cause DEC pushed these to the
> We replaced the two output electrolytic caps, the output (power)
> transistor, and the
> two disc caps that should be at the mate-n-lock that should go from 5v
> to ground.
> (These are an ECO from the late `70's.)
What does ECO mean?
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