hp proprietary uP history (9825 uP?)

From: Michael Holley <swtpc6800_at_comcast.net>
Date: Tue May 4 23:19:04 2004

> That's what you'd think but it isn't the case. 9825s in paricular are
> nearly indestrucable but I have constant problems with all of the 9845s.

In 1979 I did a data-logging project at the Hanford Nuclear Reservation in
central Washington. We had 6 or 7 trailers that collected ground water
measurement on HP 9825s (using the built in tape drive.) The measurement
equipment was connected via HP-IB.

The power was from a mobile generator. Every time the air conditioner
started the line voltage would dip about 25 volts.

This test ran for over a year with out a single failure. I was impressed.

In the spring of 1980 the place was thick with grasshoppers. They would get
into the equipment it you let them. After Mount St. Helens dumped a foot of
ash on the place there wasn't a grasshopper to be found.

Michael Holley
Received on Tue May 04 2004 - 23:19:04 BST

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