22 Aug
2011
22 Aug
'11
2:32 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Tony Duell
Verzonden: maandag 22 augustus 2011 22:10
Aan: cctalk at classiccmp.org
Onderwerp: Re: HP 9845A service/user manuals?
are quite
Hi all --
Anyone have a service manual for the HP 9485A (not the B or C)? I
picked up three of these machines in fairly good physical condition
just a couple of days ago, but their operating condition leaves
something to be desired :).
I've looked in the usual places (hpmuseum.net, and hp9845.net) but I
can only find the manual for the B/C revisions. My understanding is
that the "A" version is different in some ways (not really sure what
the hardware differences are yet.)
I _believe_ the _A is quite diferent from the -B/-C. The last 2 machines similar (differing mainly in the monitor section, the
video circutiry
being inside
the monitor).
As I am sure you know, these machines have 2 procesosrs, originally HP
BPOC
hybrid modules. One runs the user program (the
'Language Procssor Unit'),
the
other handhels I/O (the 'Periperal Processor
Unit'). There's some
arbitration
logcic to connect these processors to the varios
memory devices.
In the -A, I beleive, the 2 processors are on one PCB, there's a separate
PCB
with
the arbitration logic on it. In the -B, Each processor
anf it's part of
the
arbirtration logic goes on a PCB (stlll 2 PCB,s but
differnetly arranged).
One
advantag of this is that the LPU board can be replaced
by a 'High Speed
LPU
Option' which is a set of 3 boards stffed with
MAD2900 chips.
Of course the backplane is differnt too.
seals.
The good news is that one of the three 9845s just required some
careful reseating of the cards and ROMs and it now appears to be
working correctly (I haven't yet tested the printer (no paper yet) and
I'm
I think it'll use normal thermal fax paper.
assuming the tape drives will require a bunch of
work, assuming I ever
The tape drive mechansims are the same as those in the 9815 and 9825, and
suffer the smae problem of a decayed captsn. There are various web pages
giving repairs using things like heat-shrink sleeving or Citroen sleeve find any tapes to use). I'd love to get the
other two running as
well, hence the need for the service manual. All three appear to be
complete
I am not sure the service manual is a lot of use now. Certainly for the -B boardswapper guidewith little real inforamtion in it.
Alas the only 90845 I have is a 0945B with the high-speed LPU. And while
I've
produced as shcmatic of that, I can't produce them
of machines I don't own
:-)
-tony
You can get the instructions and dimensions (and parts) from me.
-Rik