hp proprietary uP history (9825 uP?)

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Mon May 3 12:45:11 2004

> At 06:16 AM 5/3/04 +0100, you wrote:
> >> Firstly, are the 9825 and 9845 processors the same part?
> >
> >I have a 9845 which is on the 'to be investigated' list. I will hopefully
> >be pulling it to bits (non-destructively) soon. I've not done much on it
> >yet, but from what I remember there are 2 processors in there.
> There are unless you got the optional Hi-Performace bit-slice CPU. One

I think I may well have that.

On the left of my machine is a board with one of the HP hybrids on it. I
assume it's a proccessor -- it looks very like the thing in my 9825 and

On the right there's a set of 3 boards, only one of which goes into the
main backplane. There's a little backplane on top that interconnects
these 3 boards. One of them contains 4 2901 chips (4 bit bit-slice ALUs).
Anohter contains what look to be microcode PROMs.

I assume the former is the PPU, the latter the LPU. I would certainly
describe my LPU as a bit-slice board -- do you know if the standard LPU
was an HP hybrid chip, a board of bit-slice chips or what?

I know little of the history of my 9845, other than when I got it it came
with 2 8" drives, a few 16 bit parallel interfaces, 3 HPIB interfaces
(!) a real time clock at least one RS232 interface and the rather
hard-to-find 9878 expansion chassis.

> For more information about the HP 9825 go look at my HP 9825 page at
> <http://www.classiccmp.org/hp/hp9825.htm>. See

I know the 9825 hardware fairly well...

Received on Mon May 03 2004 - 12:45:11 BST

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