1 Aug
2005
1 Aug
'05
7:01 p.m.
ard at p850ug1.demon.co.uk (Tony Duell) wrote:
I thought so. I've seen the official service manuals for virtually all
these machines (and then go back to my own pile of schematics when I
actually need to fix the things...)
Can't be! The 9830 tape drive and cassette
are very different to those
used in the 9825.
Mea Culpa. Its from the 9825A manual. The web page had the correct attribution all along. I do not know what I was
thinking as I was
typing the article (prob 9835 as I have the service manual for that
one as well).
The 9835 is one machine of that family that I've not had a chance to see
inside (I've seen inside the 9825, 9831 and 9845B). I am told it's
roughly an HP9845 with all the good bits taken out, I would like to know
if any of the good bits were left in, though. One day I'll probably get
to pull one apart.
I am also told that the 9845A is _very_ different to the 9845B (to the
extent that the former has one board with the 2 BPC processors on it,
another board with the bus arbitration/switching on it, the latter
certainly has 2 boards with one processor and half the bus control logic
on each). Again maybe I'll get to see one one day.
-tony