4 Nov
2005
4 Nov
'05
12:34 p.m.
Is this the PSU that's shown in the boardswapper
manual? It doesn't give
much detail (for some odd reason you replace the complete PSU, not just
the faulty board...), but there are a couple of pictures of it.
Yes, it is the one in the boardswapper guide. In this special case, it
is a "complete assembly exchange" guide.
The color
monitor has just enough space for one additional board, the=20
light pen controller. Since I don't have the controller board, I=20
currently don't care much about a light pen, although it would be nice=20
I don't have one either. It would be nice to find for completeness (if
only to 'complete' the schematics), but....
It's clear the light pen was fairly hardware-intensive. Many of the video
timing signals, including the outputs from the horizontal counter on the
text PCB, go to the light pen controller.
to see how it
works. However I got a working graphics 9111A tablet,=20
thats ok for now. Even a hopefully working 8"-floppy. So data transfer=20
A 9885? I have a few of those....
My 9845B came with a 3rd party mass storage ROM
module. I am told this
allows the use of HPIB disks (probably Amigo protocol). The main use of
it so far has been due to the fact that it was a little PCB with normal
chips on it, not an HP hybrid. Very useful for figuring out what the ROM
module connections are.
The 3rd party ROM is probably more useful than the original HP ROM,
since it should support the newer amigo-drives as well, not only the
drives up to 9895A (as does the original ROM).
I've heard from Dave recently, he claims to have
scanned said diagrams.
Probaby time to pester him again :-)
-tony
Thank you for the hint, I'll try again :-)
--Ansgar