22 Oct
2020
22 Oct
'20
4:21 p.m.
Interesting. I went up to the attic and opened the Unibus box. I have 3
extra 11/24 boards, and I have *NO* idea why. Oi. So anyway I started
popping them into the 11/24 chassis to see what happens. Run/halt in
halt, looking for anything.
On the first one (old style) same problem: The CPU board does not talk
to the VT52. The second one however brought up ODT with
000000
@
Progress! I immediately stopped and documented the switch settings:
Left switch : 0,0,0,1 0,0,0,1
Right switch: 0,1,0,1 0,1,0,0
All three lights (clock, 1,2) come on. And I can press enter and get @
so it does listen to the console. However if enter 0/ the CPU locks up
and the CPU light goes off. Only way to get back is to power cycle.
Likewise starting with the switch in RUN will do this, as will toggling
it to BOOT.
So it's probably unable to access memory. I did try pulling the unibus
map, then the memory, then everything but the terminator. Same response. Hm.
I could try re-jumpering my memory board to appear as MUD memory and try
it without the KT24 and see if the problem is there. It's possible. If I
did that would I put the memory in slot 2 or leave it in slot 3?
The other two boards failed the same way as the first. One of the boards
is a *new* style one with the ASICs onboard, it has three switch boxes,
is there a manual to describe this one?
I did try to set the switches on the original cpu to match the working
one. The original had
0,0,0,1 0,0,0,1 (same) 0,0,1,0 0,1,0,0
Switching thr right switch to 0,1,0,1 does seem to put garbage on the
VT52, so something might be happening.
I also found a M7850 memory board (1mb, for 11/750, 730, and kind of
11/70) which I am guessing won't work in the EUB. Anyone want to swap it
for a EUB memory board or a 256K working UNIBUS memory board?
CZ
On 10/20/2020 10:02 PM, Jay Jaeger wrote:
On 10/18/2020 10:59 PM, Chris Zach via cctalk wrote:
Weird. Set all the switches for the 11/24 CPU and
Unibus map, and still
nothing coming out of the serial port. Figured I would document the
settings and see if anyone with an 11/24 can cross-check my settings.
Serial: Because my VT52 has a male RS232 end (factory) and the 11/24 has
a male RS232 end (factory bulkhead) I am using a female-female null
modem cable. This is the same cable I use on the 11/83 CPU and it's
known working (along with the VT52). Is this the right type of cable to
use?
Yes, I use a null modem cable plugged into the bulkhead connector as well.
Switches on the CPU are:
E135: off,off,off,on,off,off,off,on=9600 baud both signal generators.
Same here from what is scribbled in my book
E124: off,on,on,off (SLU1 use signal gen 1 for tx
and rx)
Same Here
E124 5-8: off,on,off,off (no idea what these are)
I don't know offhand, either, would have to pull the board to check it.
Slots in use are:
1--M7133 CPU
Same on mine in slot 1, of course
2--M7134 KT24 Memory map
Same as mine on slot 2 as well, of course
I have had my system since February, 1988 when a friend and I hauled the
11/24, two RK07's a VT100 and and TU10 out of U Wisconsin Bascom Hall
for about $600. I have added many things to the system over the year,
including a VT11, a DR11C, an Emulex SMD disk controller, etc.
It has had one power supply repair (thanks for advice from, I think,
Tony Duel about not destroying test equipment while troubleshooting) and
early on blown SLU1 dirver/receiver chips which I replaced.
After that, I have:
M7891 UNIBUS Memory (256K, I think, presumably addressed for 0).
G7273 Bus + DMA Grant card
M7860 DR11C
M7846 RX01
M7762 RL11
....
and other stuff
....
Ending with at VT11 containing an M9302 Boot/terminator
SLU1 Interface config, J3
W1 IN (1 stop bit)
W5, W7 OUT (disable parity detection)
W6, W8 OUT (no parity is generated)
E124
1 OFF, 2 ON, 3 ON, 4 OFF
SLU1 and SLU2 both Baud Rate 1
E135
9600 Baud (S1, S2, S3 OFF, S4 ON) (Baud Rate 1)
9600 Baud (S5, S6, S& OFF, S8 ON) (Baud Rate 2)
1 J2 Pin 13 + 18
2 J2 Pin 11 (EM2)
3 J2 Pin 1 (FM2)
4 N/C
5 N/C
6 N/C
7 J2 Pin 20
8 ---- (I wrote this - probably meant N/C)
9 ----
10 ----
11 J2 Pin 12
12 J2 Pin 6
13 thru 19 ----
20 J2 Pin 16
21 - 24 ----
25 J2 Pin 13 + 18
SLU2 Interface config
Originally: Just pin 2 to J2 2+4
Baud Rate 2: W9 OUT, W10 IN, W11 OUT, W12 IN, W4 OUT
To support a TU-58 on SLU2 I added
J4 3-8 J5 2-3
J4 4-7 J5 1-7
CPU Module Jumpers (I believe, but would have to verify)
W2 OUT (power up via location 24, so usually it halts)
W3 IN (allows halt in Kernel mode)
W14 IN (Boot address 165000)
UNIBUS MAP Jumpers
TP11, TP12 presumably OUT(enables diagnostic ROM)
W13 presumably IN (enables diagnostic ROM)
I can't see Switch E58 without pulling the board to see. Same, of
course, with the jumpers. I expect they are factory default.
NOTE: A a test, I swapped in a CPU 23-001C7AA,
Floating Point, 23-002C7AA and Memory Map chip 21-15542-01 from
a PDP-11/23, and they naturally worked fine.
3--M7891 MS11-L memory (configured for extended
unibus), green light on,
red light off
4,5,6--G727
7-M7982 TS11 tape controller
8 M8256 RX02 controller
9 M9302 terminator and G7273 board
When powered on in HALT mode the 11/24 CPU board has the third LED on.
Go to RUN stays on. Go to boot, LED goes off. If the unit is turned on
with the switch in RUN, the light is out.
MS11-L has a green light on at all times. When I forgot the 9302 it had
a red light on as well, but plugging that in and restarting cleared the
red light on the memory.
Let me know if you want me to go thru the process of
1) Powering on my system (been just a bit over a year) to do basic checks
2) Pull the boards and document
3) Put them back and do basic checks again.
JRJ
2)