One more thing to fix... HP9000/380 power supply
Carlos E Murillo-Sanchez
ce.murillosanchez at gmail.com
Thu Feb 11 20:55:15 CST 2021
This decade seems to have increased the number of failing things in such
a way that the "to be repaired" backlog is growing much faster than I
can get to diminish it. Argh. A month ago my trusty HP9000/380 ran just
fine and I booted the different OS's in the SCSI and HPIB drives
connected to it (this particular machine is interesting because the
9000/300 port of NetBSD was partly developed in it: it was Mike
Wolfson's). Yesterday, it failed to turn on; the power supply is dead.
So I unracked the pile of drives and the computer, checked for obvious
things (the fuse is fine, and nothing in the power supply is swelled up
or leaking, or browned by heat; visually, it looks new; the HV caps seem
to hold a charge). I need the schematics for the power supply (at least
the output connector; I can work my way back from that) and also those
for the backplane in this hp9000/380. A preliminary search at bitsavers
and elsewhere did not help. Does anybody have these?
In the meantime, I finally improved the mainboard (had the parts for a
long while) from a 380 to a 385 by changing the clock generator, and
replacing the 68040RC25 with an RC33.
I ran this machine as a web server continuously for ten years in the
2000's, totally exposed. Many tried to hack it... and failed. Another
personal connection to this architecture is that I used Apollos and
hp9000/300 at UW-Madison back in 1989-91. Boy, did I crunch numbers...
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