[comp.sys.hp] Information Needed

law@udel.EDU (Jeff Law) (08/29/89)

A while back i can into possession of several 9836U systems.  In a desire
to run 4.3BSD i found that i have to use a 9920U cpu in my 9836box.  I
have talked to some people inside HP who said the 9836U and 9920U have
the same CPU and MMU.  I have decided this is quite impossible for the
following reasons:

1) i can not take the cpu from the 9836U and put it on the 9920U board and
   use it
2) when i do #1 the 4.0 bootroms say that i have a 68000 processor, when i 
   use the cpu provided on the 9920U cpu it says i have a 68010 processor


So what gives??  I read a while back in one of the old HP books that the
9920U and 9836U had the same cpu, but from what i have seen it isnt so!

can someone please clarify this for me?

Jeff

-- 
University of Delaware  PHONE: (302)-451-8005 or (302)-451-6339
ARPA: law@udel.EDU,  UUCP: ...!<your_favorite_arpa_gateway>!udel.edu!law

djw@hpldsla.HP.COM (09/16/89)

> to run 4.3BSD i found that i have to use a 9920U cpu in my 9836box.  I
> have talked to some people inside HP who said the 9836U and 9920U have
> the same CPU and MMU.  I have decided this is quite impossible for the
> following reasons:
> 
> 1) i can not take the cpu from the 9836U and put it on the 9920U board and
>    use it
> 2) when i do #1 the 4.0 bootroms say that i have a 68000 processor, when i 
>    use the cpu provided on the 9920U cpu it says i have a 68010 processor
> So what gives??...

The original 9920 board had a 68000. It was the same board as the 9836
(I think). When the HP300 (680[123]0 based) series came out, an upgrade
board was made available to turn the 9920(/9836 maybe - don't know) into
a 68010. It sounds like your 9920 was upgraded to a 68010 processor. 

What does the chip's label say?? The newer board will be a 68010 or 68040.

I think the relevant board numbers are 09826-66517 (old) and 09836-66512 (new).

I don't believe either configurations of the 9920 is supported by any
current HP-UX. I can't speak for the 4.3BSD OS you want to run. 

That's all I can remember from this (it's all about 4 years ago). 
The papers I have on this are going yellow with age :-)
Hope it helps.

djw

NOTE: THIS IS NOT A STATEMENT OF HEWLETT-PACKARD COMPANY.