See below, plz.
Dick
----- Original Message -----
From: "Ian Koller" <vze2mnvr(a)verizon.net>
To: <classiccmp(a)classiccmp.org>rg>; "Richard Erlacher"
<edick(a)idcomm.com>
Sent: Monday, December 10, 2001 10:48 PM
Subject: Re: Smoking around computers
Dick,
You've got plenty of other nasty stuff in the air in
machine shops too. Smoking cutting oils, mist coolant
drift, etc. One way to keep the gunk from being drawn
through the drives is to leave the cover off the case.
With an extra fan inside blowing across the boards,
keeps everything cool enough.
I find it much simpler simply to reverse the direction of the PSU fan. It takes
less than 10 minutes, and, with a sufficiently porous filter, prevents the
accumulation of nasties in the front-loading peripherals.
Ian
Richard Erlacher wrote:
>
> Bear in mind that I'm a FORMER smoker, and that there's no Catholic like a
> convert, as they say ... I don't know about truly Classic
(pre-Apple/pre-CP/M)
> hardware in this context, but from my experience
with current hardware, i.e.
> PC's with a fan at the back of the PSU that exhausts air that's drawn in
through
> the front-loading peripherals, I'd make the
following comment.
>
> I've disassembled a number of CDROM drives that clearly suffered from
> accumulation of dirt on the optic. In those few cases where (a) I knew the
user
> to be a frequent smoker, and (b) where I could
smell the smoke on the
innards of
> the drive, I normally found that I couldn't
clean the optic with anything I
> dared put near the quite soluble plastics used in the drive and specifically
in
> the laser pickup.
>
> Likewise, I often have seen and smelled what was obviously tabacco smoke
residue
> on floppy disk innards. Those were easily
cleaned, with the exception of
the
> heads, which in the cases where they were visibly
stained (and it's not easy
to
> look at the heads, but, once they're visible,
the damage is easy to see)
with
> what appeared to be smoke residue, and that
generally has rendered the
drives
> unreliable. The environment in which I most
frequently encountered this
problem
> was a machine shop where things were none too
clean anyway, but the mousepad
> showed plenty of evidence of a cigarette being held 2" in front of the end
of
> the box where the CDROM and FDD resided. It was
no wonder the CDROM and FDD
> smelled like a very dirty ashtray.
>
> This is largely the product of the stupid, Stupid, STUPID practice of
putting
> the fan in the PSU such that it exhausts the
system in the way in which it
does.
> I routinely turn the fan around, and, in fact, on
at least two of my boxes,
have
> put a second fan outside the PSU, with a filter
between the two. This has
quite
> remarkably reduced the accumulation of dirt in
the PSU as in the rest of the
> box. It does make for a bit more noise, as the two fans tend to "beat"
due
to
> the difference in speed. I once made a crude
effort to measure the
temperature
> effect of doing this, and found the results
favorable, since the reduced
> presence of dirt meant freer airflow against the surfaces of the IC's that
> required cooling in the box. I like to believe the conclusion I drew was
> correct, but it was what I expected to find, so take it for what it's worth.
>
> Tobacco smoke is VERY sticky and VERY pervasive, and should be kept out of
> computer hardware, even if only because it's so nasty and hard to remove.
This
> can be accomplished, if you don't want to
turn around your PSU fan, by
taping a
> piece of paper towel to the front of your
hardware so it requires the air to
> flow THROUGH the paper towel, rather than going, unimpeded, through your
> front-loading peripherals. That's probably adequate. Some cases once had a
> sliding cover that protected these peripherals from the hazard of smoke and
> other airborne pollutants. The air will still get into your computer, since
its
> box isn't air-tight, but at least it
won't flow through the devices that
would
> be damaged most by it.
>
> ----- Original Message -----
> From: "Douglas Quebbeman" <dhquebbeman(a)theestopinalgroup.com>
> To: <classiccmp(a)classiccmp.org>
> Sent: Monday, December 10, 2001 8:40 AM
> Subject: RE: Smoking around computers
>
> > > > From: Tony Duell <ard(a)p850ug1.demon.co.uk>
> > >
> > > > I wouldn't want anybody smoking near my computers!
> > >
> > > I've been chain-smoking around computers of various sorts for 20
years,
and
> >
I've never seen any evidence of smoke-related problems. I prefer that
> > computers don't smoke around me, however ;>)
> >
> > OTOH, audio gear seems to be very susceptible to my smoke, and I have to
> > clean all the switches and pots every three months or so.
>
> The early CDC disk drives (like many others I'm sure) has so
> much room between platters you could stick your hand in there,
> and enough room between the flying heads and the platter that
> neither smoke nor dust was a problem. One CDC engineer remarked
> to me about how they usually be smoking a cigarette while they
> were *polishing* the platters (yes, I know about the stiction
> cure joke, Lemon Pledge and all that). Which reminds me of an
> MPEG that Elsa included with the Winner3000 drivers... you
> watch this video, you'll think it's cigarettes that they're
> selling...
>
> -dq
>
>