PDP-11/23 Debugging

Ben Sinclair bensinc at gmail.com
Mon Nov 17 13:08:24 CST 2014

Thanks! I did not have a jumper on W4, so I added one, then set E21 switch
5 to "on."

I've been messing with a few things today, and it seems like the system
kind of works. I can boot the TU58 images I have from AK6DN's archive. He
has a "home grown" diagnostics image, and they all seem to run fine, though
I'm not sure exactly what they're testing. I ran the plain XXDP image and
was able to run xteko. From the 11/23 XXDP images I can run the MMU test,
which does pass after pass with no errors.

The test I can't run, and think I should be able to run before I try to do
anything else, is the JKDBDO CPU test. When I try to run this one it
doesn't print anything and drops me to ODT at 037526.

I believe it should print a "JKDBDO DCFlI AA CPU DIAGNOSTIC" banner when it
starts, but it doesn't seem to get that far.

Also, and I should have mentioned this before, from the time I got this
system the LEDs on the BDV11 are always all on. I know green and one of the
reds should be on to indicate proper power, but I believe the rest should
be off if the system is running normally. However, I'm not sure I
understand how those lights are controlled. The BDV11 manual says they are
controlled through a register via software, so maybe I'm just not running
anything that sets them. The only boot rom I have on the BDV11 is a TU58
boot loader, so if it's up to some other boot rom to set that LED register,
maybe mine just doesn't do it.


On Mon, Nov 17, 2014 at 10:56 AM, Glen Slick <glen.slick at gmail.com> wrote:

> On Mon, Nov 17, 2014 at 8:14 AM, Ben Sinclair <bensinc at gmail.com> wrote:
> > Since I do have a BDV11, am I correct in that I should just leave the aux
> > switch alone and continue debugging elsewhere?
> >
> Do you have jumper W4 installed or removed on your M8186? If you are
> using a BDV11 with the M8186 system then I believe you would normally
> have jumper W4 installed on the M8186.
> Then on the BDV11 you would set the E21 Switch 5 to the On/Closed
> position so that the LTC function is software controlled by Bit 6 of
> the resister at 177546.
> EK-KDF11-UG-PR2_Mar79.pdf
> Page 2-2, 2.2.2 Event Line - W4
> EK-BDV11-TM-001_Mar78.pdf
> Page 3-3,Table 3-1, BEVNT L Switch
> Page 4-22, Figure 4-11, BEVNT Logic
> -Glen

Ben Sinclair
ben at bensinclair.com

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