29 Jul
2009
29 Jul
'09
10:39 a.m.
Re: "If you mean the power supply fan, then that means nothing in the 5150
(AC fan?)"
That's not true. The fan is run on DC from one of the outputs (12 volts, I
think, but it might be 5 volts). So a working fan is a good sign. But an
entire output voltage can still be completely dead.
29 Jul
29 Jul
11:56 a.m.
On 29 Jul 2009 at 13:39, Barry Watzman wrote:
Re: "If you mean the power supply fan, then that
means nothing in the
5150 (AC fan?)"
That's not true. The fan is run on DC from one of the outputs (12
volts, I think, but it might be 5 volts). So a working fan is a good
sign. But an entire output voltage can still be completely dead.
Not on the original version of the 16-64K 62.5 watt 5150 "Black Box"
power supply--it used an AC fan. I'd suspected this was done to
thwart those who wanted to buy the 5150 in the US (this was before
the export version was available) and ship them overseas. But it
could have been a matter of what was available to manufacturing.
The official word that I received through IBM Marketing that if we
did so, any warranty would be void--they did not mince words. We
bought a bunch and shipped them to India anyway--ran them from a
rotary converter that put out 120v 60Hz. Given the state of Delhi's
electrical distribution system at the time, it was probably just as
well--at least there was some measure of line regulation.
--Chuck
12:10 p.m.
On 29 Jul 2009 at 13:39, Barry Watzman wrote:
> That's not true. The
On Wed, 29 Jul 2009, Chuck Guzis wrote:
Not on the original version of the 16-64K 62.5 watt
5150 "Black Box"
power supply--it used an AC fan. I'd suspected this was done to
I am hesitant to tell anybody that they are WRONG about the original 5150
power supplies. I sae at least 5 different versions shipped in them!
The first one that I got (direct from IBM) was black and had a WHITE
switch toggle!
With ONE of the varieties (with red switch toggle), the switch itself
broke often. But we pried the tabs open moved the contacts back into
position, secured them, and got them working again.
--
Grumpy Ol' Fred cisin at xenosoft.com
2:58 p.m.
On 29 Jul 2009 at 12:10, Fred Cisin wrote:
I am hesitant to tell anybody that they are WRONG
about the original
5150 power supplies. I sae at least 5 different versions shipped in
them!
That's true. However all of the very early ones that I've seen have
AC fans. I think when demand surprised IBM, they started using
alternate sources for many parts.
--Chuck
21 Aug
21 Aug
2:37 p.m.
New subject: Free early PC software manuals
V1.0 IBM COBOL
V1.0 IBM Fortran
V1.0 IBM Pascal
V1.0 IBM MASM
V2.0 IBM PC-DOS
? Turbo C
Very beat up, grimy page edges
All pages are PROBABLY there
NO binders
They are bolted into a very beat-up 12" counter metal reference rack
(http://www.quill.com/master-starter-sets/cbs/052850.html)?
They may have one or more additional binding holes drilled.
They were used in a community college student computer lab for years.
Free if you come and get them in Berkeley.
if I separate them, or ship them, then I will charge money!
Thank you,
--
Fred Cisin cisin at xenosoft.com
Berkeley City College Library
2050 Center St.
981-2964
22 Aug
22 Aug
8:10 a.m.
New subject: Free early PC software manuals
I know I have IBM Pro Fortran 1.0. Some version of Pascal and Masm (not sure if
they're 1.0, but I'll check eventually. They're likely contemporary w/the
FARTRAN LOL version). I had the mind to take snaps of these and put them somewhere or
forward them to Al K. If anyone has pressing need, I could dig them out (easily the most
arduous portion) and take digicam photos of the pages. They'll read perfectly. I also
have the options and adapters manuals (w/the PGA details), which is currently *scattered*,
but I do have them.
--- On Fri, 8/21/09, Fred Cisin <cisin at xenosoft.com> wrote:
V1.0 IBM COBOL
V1.0 IBM Fortran
V1.0 IBM Pascal
V1.0 IBM MASM
V2.0 IBM PC-DOS
? Turbo C
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