23 May
2016
23 May
'16
7:46 a.m.
I have no idea what "3011-cf" is. Isn't it just a a DD11-C backplane with
power-wring entering from the back, rather than through small circuit
boards?
I removed the core backplanes and returned the DD11-C to the orig config
next to the CPU. I re-inserted cards as-was. I am not getting comms from
the M7856. I may have shorted the card. So, I will work on that for now.
"One step back"
thanks
b
UNIBUS 10 A-B (LEFT SIDE OF UNIBUS)
M7856 10 F-C (RS232 WITH 19.2 OPTION?)
G7273 11 C-D
7891 12 A-F (64k MEMORY)
M9312 13 A-B (ROM CARD)
672A 13 D (GRANT CONT.)
That looks like a reasonable setup provided that jumpers W1- W5 are
installed on the M9312. You should be able to install the RL11 in slot 11
when you remove the G7273. Make sure that the wire-wrap between CA1-CB1 is
cut on slot 11 if you install the RL11 there. Also make sure that CA1-CB1
wire-wrap jumper is installed in slot 13 (or install G7273 card in 13C-D)
I am going to switch to another backplane and start over. Don't know
what
I am doing yet to be honest. I have to read the
manuals and get better
educated to properly get these parts working together correctly.
But all this still doesn't now explain the problem that you cannot access
(or send characters to) the serial port. It could very well be the power
problem as Noel suggested. If I were you I would try to get back to the
state where it worked, shortening the Unibus to just include the 4-slot
back plane and the CPU backplane and also remove the RL11 for now. Then
install the RL11 in slot 11 when everything is working.
/Mattis