I am putting an MVII boardset into a BA23 chassis that once housed
a PDP-11/73. The PDP has lost its ability to arbitrate the QBus. :-(
Has anyone determined the pinouts for the 20-pin cabinet connector?

I will try to figure it out myself, but if anyone has already done it
I would appreciate the help.

I figure:

4 lines out - LED (I have some TIL311s)
1 line out  - LED power
4 lines in  - console baud rate
1 line in   - console halt select
3 lines in  - boot mode select
2 lines in  - TOY battery
N lines for ground

Pinout description or even a scan of the board would be great.

Booting an MVII is SLOW. Booting an MVII at 300baud is SSSLLLOOOWWW.

Thanks,
-chuck