15 Jul
2005
15 Jul
'05
12:51 p.m.
Hi All,
I have a PDP-11/05 (11/10) in a 5.25" box version which I'm putting
together. It's going to be equipped with 8Kb of core and a RX02
floppy interface. When powering up, led's come on, but there is not
much action to get. Look like the -15V of the PSU is not working
properly.
The PSU is a different one compared to the well known bricks used
in BA11 boxes. This one delivers +5V, +15V and -15V and is labelled 5409728.
Anybody have a schematic of this PSU by any chance?
Thanks,
Ed
19 Jul
19 Jul
3:40 p.m.
Hi All,
I have a PDP-11/05 (11/10) in a 5.25" box version which I'm putting
together. It's going to be equipped with 8Kb of core and a RX02
floppy interface. When powering up, led's come on, but there is not
much action to get. Look like the -15V of the PSU is not working
properly.
The PSU is a different one compared to the well known bricks used
in BA11 boxes. This one delivers +5V, +15V and -15V and is labelled 5409728.
Anybody have a schematic of this PSU by any chance?
I'm suiprised it;'s not on Bitsavers. Have you looked at all the 11/05
and 11/10 docs there? Maybe also the GT40 printset, the GT40 is built in
the samve box with the same PSU (and for that matter an 11/05 CPU board set)
I certainly have this schematic, but no easy way to get it to you. If you
need help sorting out the PSU, feel free to ask me.
-tony
20 Jul
20 Jul
12:52 p.m.
Hello Tony,
The fault is repaired, it turned out to be a bad solder joint on one
of the resistors. After resoldering, all voltages are fine.
Thanks,
Ed
Hi All,
I have a PDP-11/05 (11/10) in a 5.25" box version which I'm putting
together. It's going to be equipped with 8Kb of core and a RX02
floppy interface. When powering up, led's come on, but there is not
much action to get. Look like the -15V of the PSU is not working
properly.
The PSU is a different one compared to the well known bricks used
in BA11 boxes. This one delivers +5V, +15V and -15V and is labelled
5409728.
Anybody have a schematic of this PSU by any chance?
I'm suiprised it;'s not on Bitsavers. Have you looked at all the 11/05
and 11/10 docs there? Maybe also the GT40 printset, the GT40 is built in
the samve box with the same PSU (and for that matter an 11/05 CPU board
set)
I certainly have this schematic, but no easy way to get it to you. If you
need help sorting out the PSU, feel free to ask me.
-tony
23 Jul
23 Jul
4:31 p.m.
New subject: PDP 11/10 is working
Well, the PDP 11/10 is working now. After repairing the PSU and making
sure the voltages were within limits, I placed it back.
Then I did vacuum the backplane and also cleaned the card edges with IPO.
After inserting the modules, I entered the value '1000' in the SW and pressed
'load addr'. It nicely did show the address in the display. The I tried
to load the value '777' into it, by pressing 'DEP'. Display didn't
change,
so I reloaded '1000' and see if there was a value, ... not!
Weird, but possible the on of the G boards was faulty, or the core itself
was in error.
After removing the G110, I rechecked the jumpers, and sure I missed one,
the board was set for the 2nd 8K area. So after soldering in the jumper
it was replaced and the machine powered on again.
This time I executed the same actions, and this time I got the entered
value back. A little test program was then loaded to see if the processor
did work at all, which it did (I used the 'cont' switch to see if a
loop was executed).
Only thing to remain is to make a little cable which needs to go into
the berg connector at the back to interface with the on board uart
for the console. After that I'm goint to add an RX02 interface card to
see if I can load XXDP and perform some cpu diagnostics.
Ed
4:35 p.m.
Forgot to add picture links, the pics can be found at
www.groenenberg.net/tmp/pdp1110_1.jpg
www.groenenberg.net/tmp/pdp1110_2.jpg
www.groenenberg.net/tmp/pdp1110_3.jpg
Ed
6935
days inactive
6943
days old
4 comments
3 participants
participants (3)
-
ard＠p850ug1.demon.co.uk -
ed＠groenenberg.net -
quapla＠xs4all.nl