24 Jan
2012
24 Jan
'12
1:54 p.m.
First: Thanks to all who contributed to this thread. I learned a lot so
far...
Just a little report of work I've already done on the machine:
The PSU is now on my workbench. It's not a completely write-off unit, I
think repair is possible - further checkings are needed. Nearly all major
Components were found in my parts-box - the rest is a matter of time and
studying the schematics and lots of measuring.
The boards and the backplane will be cleaned and inspected on next weekend
but they look promising. One IC on the RL02 controller looks bad (bent
pins, scratched top) but I should have a spare....
In today's lunch break I cleaned up the RX50 drive and completed some
missing screws in the chassis and last but not least wired up a nice load
for the psu (had some huge resistors in my lab)....
Any further suggestions, ideas, hints etc are as usually greatly
appreciated.
Regards,
Wolfgang
PS: Some of you may know that I am collecting PDP-11 Operating Systems. A
Fellow from Russia will send me some Tapes of a DSM-11 Clone. These Tapes
are 9track and my Drive is a total writeoff. Maybe someone of you could
assist me in reading this Tapes (as far as I found out there are 2 Tapes)?
Also any hints for surviving 9track Drives are appreciated - I'd really
like to give one unit a good, clean home (I am located in Austria; but
beware: due to the health care of my son I am a bit low on funds and hobby
budget is somewhat limited, but with a little time we can work out a
solution)
--
Wolfgang Eichberger - OE5EWL
Operating System Collector
Blog: 5ewl.blogspot.com
Homepage: www.eichberger.org
2012/1/24 Pete Turnbull <pete at dunnington.plus.com>
Johnny Billquist wrote:
On 2012-01-24 05:34, allison<ajp166 at
verizon.net> wrote:
Special note early RQDX2s must be in the last unoccupied slot, they do
Mmm, I agree, but a few "RQDX2s" on the second user market were actually
field-modified RQDX1s (not necessarily by DEC) and some of those were
reworked better than others, hence my quote marks; also sometimes boards
are referred to incorrectly as RQDX2s just because they had an EPROM
upgrade -- and that isn't sufficient to fix the bus grant problem, nor does
it really make the board an RQDX2.
--
Pete Peter Turnbull
Network Manager
University of York
not pass the
bus grant signals.
As far as I can remember it's (only) the RQDX1 that have this problem,
but it applies to *all* RQDX1.