18 May
2016
18 May
'16
8:33 p.m.
From: Ed Groenenberg
After hooking up the PMK05 to the unibus, the machine
was powered up
with the memory card, and the 'NPG' led was on.
Oh, that's truly wierd. Most memory cards don't even connect to any of the
bus request/grant lines - they often have short loopbacks from each 'grant
in' pin to 'grant out' - not sure about NPG because canonically, that is
jumpered through on the backplane.
A couple of things to check: First, does that memory even have traces
connected to the NPR/NPG-in/NPG-out pins? Second, does a different, known
working card, provoke any problems in that slot? (E.g. your serial interface
card?) I'm wondering if the problem is the slot, not the card.
Noel
19 May
19 May
1:53 a.m.
On Thu, May 19, 2016 02:33, Noel Chiappa wrote:
Yes, it does indeed to appear as weird.
The memory card has a trace to continue the NPR line (like the little
wire on the backplane). The card should be okay as it was the original card.
I changed it for another meory cards (same type), and it has the same
problem. I can indeed put the memory card in slot 5 and move the DL11 to
slot 4 and see if still allows me to send a character to it (with or
without
the memory in place).
I wish I had the documentation of the PMK05, the 2 sheets I have are just
a snippet of information.
Ed
Ed
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From: Ed
Groenenberg
After hooking up the PMK05 to the unibus, the
machine was powered up
with the memory card, and the 'NPG' led was on.
Oh, that's truly wierd. Most memory cards don't even connect to any of the
bus request/grant lines - they often have short loopbacks from each 'grant
in' pin to 'grant out' - not sure about NPG because canonically, that is
jumpered through on the backplane.
A couple of things to check: First, does that memory even have traces
connected to the NPR/NPG-in/NPG-out pins? Second, does a different, known
working card, provoke any problems in that slot? (E.g. your serial
interface
card?) I'm wondering if the problem is the slot, not the card.
Noel
10:30 a.m.
2016-05-19 7:53 GMT+02:00 E. Groenenberg <ed at groenenberg.net>:
On Thu, May 19, 2016 02:33, Noel Chiappa wrote:
up
the
Since you have a 11/34 I guess that you have a programmer's console (you
maybe mentioned it earlier on). What I did when checking out a 11/04 was to
follow this nice article by J?rg Hoppe:
http://www.retrocmp.com/tools/pdp-1134-programmers-console . Use the M7859
and console only on the bus, just to minimise the number of devices on the
bus that could cause trouble.
In maintenance mode you could check the memory and serial ports etc stand
alone, moving them between different slots etc.
/Mattis
From: Ed
Groenenberg
> After hooking up the PMK05 to the unibus, the machine was powered with the
memory card, and the 'NPG' led was on.
Oh, that's truly wierd. Most memory cards don't even connect to any of bus request/grant lines - they often have short
loopbacks from each
'grant
in' pin to 'grant out' - not sure
about NPG because canonically, that is
jumpered through on the backplane.
A couple of things to check: First, does that memory even have traces
connected to the NPR/NPG-in/NPG-out pins? Second, does a different, known
working card, provoke any problems in that slot? (E.g. your serial
interface
card?) I'm wondering if the problem is the slot, not the card.
Noel
Yes, it does indeed to appear as weird.
The memory card has a trace to continue the NPR line (like the little
wire on the backplane). The card should be okay as it was the original
card.
I changed it for another meory cards (same type), and it has the same
problem. I can indeed put the memory card in slot 5 and move the DL11 to
slot 4 and see if still allows me to send a character to it (with or
without
the memory in place).
I wish I had the documentation of the PMK05, the 2 sheets I have are just
a snippet of information.
Ed
4:23 p.m.
New subject: PDP-11/34a hung bus problem -> solved.
Well, I feel somewhat stupid, but the problem with the hung bus is solved.
The cause of it? no jumpers on the backplane to bypass the battery backup.
The machine had a BBU regulator, but it was removed as I don't have the
battery pack. So, after adding the 3 jumpers the NPG signal was cleared
after a cntrl+halt and characters could be printed when deposited at
address 777566 (with memory in the backplane).
So, next step is to add a RL11 controller and see if it will boot RT-11.
But that is for the weekend....
Ed
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3 comments
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participants (3)
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ed＠groenenberg.net -
jnc＠mercury.lcs.mit.edu -
mattislind＠gmail.com