7 Mar
2005
7 Mar
'05
7:17 p.m.
Hi,
I think I have arrived at pretty much the same point as Jay on my 11/45. Ive stripped it
down to the minimum - processor, memory management, memory (UFUM) and timing generator.
Toggling in from the front panel, I can see the data lines change, but I'm not getting
address data on the Unibus.
My next test, is to try and look at the address data between the processor and the memory
management module.
Does anyone have any other tips?
Thansk
Jim.
Please see our website the " Vintage Communication Pages" at WWW.G1JBG.CO.UK
7 Mar
7 Mar
7:52 p.m.
Hi,
I think I have arrived at pretty much the same point as Jay on my 11/45. =
Ive stripped it down to the minimum - processor, memory management, =
memory (UFUM) and timing generator.
Toggling in from the front panel, I can see the data lines change, but =
I'm not getting address data on the Unibus.
My next test, is to try and look at the address data between the =
processor and the memory management module.
Does anyone have any other tips?
A general comment : If you're missing an entire data or address bus, it's
more likely you're missing an enable signal than all 16 or 18 drivers for
whatever set of lines have failed at once. So I'd do essentially what
you're doing (trace the lines backwards towards the source), then start
looking at enables for whatever stage seems to have failed.
-tony
9:58 p.m.
I think I have arrived at pretty much the same point as
Jay on my 11/45.
Ive stripped it down to the minimum - processor, memory management, memory
(UFUM) and timing generator.
Toggling in from the front panel, I can see the data lines change, but I'm
not getting address data on the Unibus.
My next test, is to try and look at the address data between the processor
and the memory management module.
Does anyone have any other tips?
Jim,
If you've removed processor options, then you will have to change the
jumpering on the processor to match.
Have you verified that ACLO and DCLO are both inactive and that your
power supplies are good?
Have you attempted to write data to your console port (as discussed in
prior messages)?
--tom
8 Mar
8 Mar
4:34 p.m.
From: "Tom Uban" <uban at ubanproductions.com>
If you've removed processor options, then you will have to change the
jumpering on the processor to match.
The processor and memory are as original. (no FP unit)
Have you verified that ACLO and DCLO are both inactive and that your
power supplies are good?
The power supplies are good - DVM and scope checked.
I haven't checked ACLO or DCLO, will try that tomorrow (assuming I get out
of work at a reasonable time :-()
Have you attempted to write data to your console port (as discussed in
prior messages)?
I can get address data to the front panel, but not to any other devices.
Looking at the KT11 manual, this would suggest that the KT11 is at fault.
The address data for the unibus and the front panel display are generated in
the KT11, but leave it by different paths. This would suggest that the chip
select path for the Unibus driver is at fault, time for extender card and
logic probe again.......
Jim.
6:09 p.m.
If you've removed processor options, then you will
have to change the
jumpering on the processor to match.
On an 11/35 (or 11/40), yes, but not on an 11/45. I don't think there are
any jumpers on that set of processor boards. The only thing to be aware
of is that there's a backplane jumper for the NPG line across the KW11-L
slot, which you cut when you fit that (line time clock) card. You should
re-make it if you ever remove the KW11-L
-tony
7072
days inactive
7072
days old
4 comments
3 participants
participants (3)
-
ard＠p850ug1.demon.co.uk -
jim＠g1jbg.co.uk -
uban＠ubanproductions.com