HP 1000 cmoputer (parts maybe)
jwest at classiccmp.org
Wed Apr 19 11:21:30 CDT 2006
>I finally got a few photos of the HP 1000 that I bought a couple of months
Another HP'er on the list, awesome :D
> any opinions on what I have, and what steps should be taken before trying
> to do anything with it?
Yeah, do not turn it on before opening up the power supply. The power supply
is extremely trivial to remove. Undo the molex connectors up front (or
unhook the 4 or so wires if it's that version). Slide the two catches in
front to unlatch. There may be two or four screws in back. Then slide the
whole thing out the rear. Open the top plate (about 10 screws). Remove all
the foam, and replace it! This power supply has a piece of foam glued to the
top coverplate that is almost always turned to mush. It gets in everything
in the power supply and the power supply doesn't take well to that from a
heat perspective. Blow it all out thoroughly. I usually remove solids by
hand, then vacuum, then compressed air. Then make sure to glue another piece
of foam to the top cover, because if you don't, the wrong pressure at the
right time can short the metal top to the cards inside - or worse, let the
cards inside come loose.
> It appeared to have had a Tandberg tape drive attached at some time.
In all my years of focusing on HP 2100/21MX M-E-F boxes, I've only come
across ONE of those tandberg tape interfaces. I'd love to know what drive
they went to - I believe the tandberg interface was 3rd party. I would
imagine (given "Tandberg") that we're talking QIC-525 or something like
that? I have no clue, as I said I've only seen one interface. I stuck in on
the shelf in case I ever found said drive :)
> the cables connected to the back of each card have all been cut by the
> scrapper that had it before I did.
Of course, take those cables off completely. Cutting could have created
shorts - before power up. Keep the hoods though, they are hard to find and
> There sounds to be at least one small part (screw, nut, broken plastic)
> rattling around inside the front area, so it will have to be opened no
> matter what.
The memory card cage is in front, behind the front panel. Should be a key in
front (or two quickrelease tabs on older M series) that allows the front
panel to swing down (or come off if tabs). You'll want to reseat the cards
in front and back, and also the ribbon cables between the cards in front.
Those memory cables are known for being finnicky. If you can't find the
floating part.... there is one screw on the rear towards the bottom. Take
that screw out, and the whole bottom panel will slide back an inch or so,
then off. You'll find the part sitting there likely.
> There was an empty slot a the top of this, so I may be out anything
> it may be a junk spare cage with a bunch of I/O if I had to guess.
No, that's not a problem at all. If you were using software that worked in
polled mode, empty slots between cards were fine (and common). But if you
were running anything that used interrupts, there could be no empty slots
between cards (there was also a jumper card available, I have truckloads of
those). But more to your point - after the last card, open slots are OK no
matter what... plus, the interrupt chain starts at the bottom, so open slots
at the top are likely OK.
> At least
> I didn't out a lot for it. I have to admit I was seduced by the switches
> and lights that appeared to be on the front panel, and an obvious need to
> fill some space in my pile with something.
I like the front panel on the 21MX MEF boxes (yours is a 2109B). I
definitely far prefer the panel on the 2100A/S, but others will disagree
(Bob S.). And when I compare those two - I'm talking from the perspective of
entering long programs, not just setting a few registers here and there.
> It appears to have a battery pack that was the rear panel. Due to the
> construction, I wonder if it was added by a system integrator.
I have several of the standard HP battery backup options. Yours looks to be
factory. If not, it's a very very close design. The gel packs in it likely
don't hold a charge anymore, and are expensive to repair. You'll be wanting
a battery eliminator plug I bet... the system will not come up without
either a battery eliminator plug or a real battery.
Nice Por... er... Pics :)
Looks like you have an HS term board ... that's a good all around board as
far as compatability with most terminals (non-HP). However, it's a PIG as
far as load on the system. It's the board required for TSB console though.
The BACI boards are much kinder to the system.
The microcircuit boards are sweet... I could always use a few more of those
myself - if they are the nicer C variety. They are a general purpose
interface board used for a bajillion different things, including a lot of
custom stuff. After all, HP's were designed by engineers for engineers, and
typically not for general purpose computing. More often than not, process
control, ATF, etc.
I'd be curious (if I were you) just what microcode roms were on that FAB
board under your cpu card there :)
The slides you have there are the ones I've generally seen come from
Oh - something important. Judging by the front panel pencil marks, this
system was booted from the device at IO select code 16. That would also be
the slot that your tandberg interface was in. So, most likely, this system
booted from that cartridge tape drive. I suggest you preserve the boot roms
for this machine! You likely have a special boot rom just for that tandberg
interface card which may well shed light on how that card and drive worked.
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