OT Plugging : HP Integral IPC on ebay

Rik Bos hp-fix at xs4all.nl
Sun Nov 16 14:08:36 CST 2008


-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Tony Duell
Verzonden: zondag 16 november 2008 18:55
Aan: cctalk at classiccmp.org
Onderwerp: Re: OT Plugging : HP Integral IPC on ebay

> > HP85   ( just got it, but already tired of it ).
> Now that I can understand :-). I've never found the HP 80 series of 
> desktops to be particularly interesting.
> -tony
> > HP85
> But it is very easy to use as instrument controller, or CS/SS80

Sue, but I believe CS/80 exerciser software is available for the HP9000/200
machines (which includes the 9826), and that it has much the same
functionality as the HP85 version.

The HP9000/200 machines have (to me) many advantages over the HP85 series,
including an easier-to-use system bus (the HP85 bus is just strange, the
HP9000/200 bus is the 68000 bus with a few more signals), easier to repair
(about the only stnadard chips in an HP85 are the DRAMs, the 9000/200
machines are almost all standard, with a few PALs and ROMs) and a nicer
selection of I/O cards.

> If you got a 9121 as external drive, tapes are not a real option.
> Small OT question do you know how the wires on the HP-65 cardreader 
> head are soldered (not the ones on the reader pcb)

I am not sure what you are asking. I have (unofficial) schematics of the
HP65, along with almost all other (repairable) HP handhelds. The card reader
had has 5 wires which are soldered to the card reader PCB, but you say it's
not that end you're interested in. Every head I've seen has been potted in
epoxy, so you can't see how the wires are connected at that end, or indeed
resolder them. 

What are you trying to do? I might well be able to help.

Incidentally, why is this OT? The HP65 is certainly a classic (pun
intended). It's also, IMHO, a computer (the internal architecture is that of
procrssor + RAM + ROM (albeit the ROM and RAM are on different
(serial) buses; it is user programmable). I can't think of a sensible
definition of computer which includes things like the KIM-1 and excludes the


I'm repairing/restoring a HP-65 with severe oxidation-damage on the
cardreader pcb and a lose headwire.
This head was filled with white siliconkit so I was able to remove it and
resolder the wire (yellow one). After resoldering,I refilled it with 2k
epoxy glue, terminal resistance seems to be allright for both coils and I'm
now restoring the PCB traces. The head connection explained it self.


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