[PDP8-Lovers] Re: how to clean a PDP8/A, dishwasher?

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Mon Dec 17 16:06:16 2001

On Dec 17, 9:30, Johnny Billquist wrote:
> On Sun, 16 Dec 2001, Pete Turnbull wrote:

> They wash them yes. They *don't* put them in a dishwasher. There is a
> hughe difference.

I know some who do... Anyway, if the dishwasher doesn't use a hot air
drying cycle, there's little difference.

> > Yes, a certain amount of care is required, and certain
> > things can't tolerate being soaked or being too hot or given too much
> > mechanical agitation (stress).
> Which all are things I suspect a normal dishwasher might do.

Domestic ones I've seen won't. Apart from the soaking -- that's the point
of using it, obviously. Very few things are intolerant: some relays,
transformers, a few types of switches, etc, usually just because they take
too long to dry out. And core mats, of course, because they're very
fragile and extremely hard to repair.

> > But how would you deal with a piece of
> > equipment that was smoke damaged or had been left in the rain or had
> > in a river or had been infested with vermin or had a can of Coke
spilled in
> > it? I've had to deal with all of those and more over the last two
> > and washing is the only way.
> Grab a bottle of isopropanol, some swabs, and start working.

Doesn't work well on smoke-damaged boards, Coke, etc, and water is far
cheaper and safer (for the user, too).

> ESD should never be ignored, but in the case of computer from the 60s and
> 70s, ESD is really not an issue. We don't have CMOS, we have old style
> TTL here... It is not ESD sensitive.

I think you'll find most experts disagree with you there :-) TTL may be
much less sensitive than old CMOS and even modern CMOS and TTL
replacements, but it is still sensitive and can be damaged by ESD. It's
not so likely to be damaged when soldered into a complete circuit, but it's
possible. I've had at least two QBus boards damaged by ESD through
careless handling.

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Mon Dec 17 2001 - 16:06:16 GMT

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