9 Jan
2022
9 Jan
'22
6:06 p.m.
If you have a 10-1/2" box, you can mount a MUD
backplane - but you might
still have an issue because the older BA11-D boxes use the old 9-pin power
connectors, and the MUD backplanes (DD11-C, -D, etc) all use the newer 15-pin
ones.
There we go. I have an 11/05 in a BA11-D box with a DD11-B expansion
backplane with a 9 pin power plug sourcing +15, -15, +5.
So is the DD11-B a MUD backplane? If not, what is it?
The later /05's, /40's and /45's were the
first ones to provide +20V, for the
then-new MM11-U. On machines which took H744 'brick's, the _later_ harnesses
could take a H754 +20V, -5V regulator 'brick'. Alternatively, _some_
BA11-L's
(used for the /04 and /34) had the right version of H777:
Hm. So I could get the power for the +20/-5 by replacing the 744 with a
754 and wiring up my own harness. However that would have two problems:
1) I'd be low on +5 for things like an RL11 controller.
2) I don't know if the DD11-B uses the 20 volt and -5 volt lines for
something else.
This is so much fun!
C