On Tue, 22 Oct 2002, Clayton Frank Helvey wrote:
> Modem control is the difference, plus the CXY is probably equipped
> with higher-performance UARTs. The extra serial ports out of the old
> MV3100 Model 20's extra serial port card were data leads only, DEC423
> (compatible with RS232 of course). The 36 pin 'centronics style'
> cable goes to a H3104 8 MMJ port 'harmonica' breakout.
>
> I used to know what the cable number was; I have the H3104 in my
> cabinet of goodies but no cable is hiding in the drawer with it.
> Can't recall if I have one or not; but I think finding the number on
> the net would be relatively easy.
Based on feedback from several sources, the cable I'm looking for is
the BC16C (i.e. BC16C-10 for the 10ft long one.) I managed to find the
following pin out information for the BC16C:
-> The BC16C and BC16D cables are used in conjunction with the H3104
-> Cable Concentrator (Harmonica).
->
-> Specification:
->
-> PVC shielded, 1.5cm diameter.
->
-> Number Of Conductors 36, consisting of 18 twisted pairs.
->
-> Connectors BC16C - one right-angle 36-way centronics style
-> connector, and one straight 36-way centronics connector.
->
-> BC16D - two right-angle 36-way centronics style connectors.
->
-> Wiring Pin to pin.
->
-> Pin Signal Pin Signal
-> 1 Line 0 Tx+ 19 Line 0 Tx-
-> 2 Line 0 Rx+ 20 Line 0 Rx-
-> 3 Line 1 Tx+ 21 Line 1 Tx-
-> 4 Line 1 Rx+ 22 Line 1 Rx-
-> etc etc
-> 15 Line 7 Tx+ 33 Line 7 Tx-
-> 16 Line 7 Rx+ 34 Line 7 Rx-
-> 17 Spare 35 Spare
-> 18 Spare 36 Spare
If I were feeling bored, it would be rather easy to hack together
one of my own cables.
> Oh, and Brian, the serial ports on the back are actually NOT numbered
> the way you're thinking; the DB25 is TTA2:, the first MMJ port to the
> left looking at the back of the machine is OPA0: (console), the next
> is TTA1:, and the last is TTA3:.
I'll definitely keep this in mind. I would note that the relative
positions of the ports on the back of my MV3100 are somewhat different
from a standard MV3100. Also, I believe the other fellow's images I'm
referencing here are mislabelled. I think his system is a MicroVAX
3100/10 and that he's confused the "M30" designation with that of the
vanilla VAXstation 3100 (a.k.a. the VAXstation 3100/M30).
Front of a regular MV3100:
http://john.ccac.rwth-aachen.de:8000/alf/mv3100_m30/mv3100_m30_full.jpeg
Front of my rackmount MV3100:
http://world.std.com/~bdc/pics/mv3100/mv3100-1.jpg
Back of a regular MV3100:
http://john.ccac.rwth-aachen.de:8000/alf/mv3100_m30/mv3100_m30_rear_full.jpeg
Back of my rackmount MV3100:
http://world.std.com/~bdc/pics/mv3100/mv3100-2.jpg
http://world.std.com/~bdc/pics/mv3100/mv3100-3.jpg
It's obvious some of the ports were shuffled when they redesigned the
case.
-brian.
Received on Wed Oct 23 2002 - 01:47:00 BST
