General Question about UNIBUS backplanes
billdegnan at gmail.com
Tue May 24 10:03:10 CDT 2016
> What never was clear to me was if you actually could access the serial card
> or not from the console. I.e. did it respond when addressing it? If it did
> respond I would check that there were correct power supplied to the 1488
The M9312 does yes have the terminators installed.
I have not been able to activate the M9312 with the DD11C backplane
"behind" the newly-installed core and DD11B backplanes. I don't know if I
fried it somehow recently. It was working before. The M9312 is installed
on the 4th slot in the DD11C with a NPG card below it. It is also possible
that instead I am not communicating with the cards in the back of the bus.
Typically I toggle and run from address 165144 from the front panel, then
use the console program from a terminal to go from there. Since my recent
shenanigans with the backplanes the console program does not appear to load
When I load the address 165144 I see the correct address on the front
panel. RUN BUS PROC CONSOLE are all lit. When I enable and start the
system the address lights go out except 020 (2nd to last light). The RUN
BUS PROC CONSOLE stay lit.
When I examine
I don't know the status of my M7856 card. There are things I can try but
first I believe I should test to see if I am "pinging" to the DD11C at
all. I also need to check power output levels and adjust.
I am thinking also test the MOS RAM from the DD11C by itself to see what
that tells me. I know to address the RAM somewhere other than the 16K
space from 000.
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