hp proprietary uP history (9825 uP?)

From: Joe R. <rigdonj_at_cfl.rr.com>
Date: Mon May 3 15:23:48 2004

At 06:45 PM 5/3/04 +0100, you wrote:
>> 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.

   That would be cool! I have four or five 9845s but I don't think any of
mine have that option.

>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 believe it was a hybrid.

>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.

  hard to find? Sheesh I find them all over. nearly every 9825 that I find
comes with one. I just passed one up in a scrap yard a couple of weeks ago.
Also passed up a couple of the RTC modules. The RTC modules with the IO
cable are cool. You can interface them to external devices and trigger the
devices or use the device to trigger events in the 9845.


>> 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 - 15:23:48 BST

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