17 Dec
2001
17 Dec
'01
11:06 a.m.
On Dec 17, 9:30, Johnny Billquist wrote:
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.
Doesn't work well on smoke-damaged boards, Coke, etc, and water is far
cheaper and safer (for the user, too).
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. > But how would you deal with a piece of
> equipment that was smoke damaged or had been left in the rain or had
fallen
> 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
decades,
and washing is
the only way.
Grab a bottle of isopropanol, some swabs, and start working. 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
MSI
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
17 Dec
17 Dec
12:07 p.m.
On Mon, 17 Dec 2001, Pete Turnbull wrote:
It works, but it requires more work.
Eh? Q-bus cards, even the oldest you can find, are LSI stuff. You won't
find much of anything even *that* modern in a PDP-8. Actually, much Q-bus
stuff is really modern compared to what I'm thinking of...
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
On Dec 17, 9:30, Johnny Billquist wrote:
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.
Don't forget old transformers, which often use something looking very much
like paper for isolation.
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
MSI
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.
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