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.
Or send a message to Newman Computer Group, Gemini
Digital, etc and find out how much they'd charge for
one.
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 took a good marker to my MV3100 Model 20e and marked
those on the back 'cause I always forget.
-- Frank
--- Chris Craft <ccraft_at_netgenius.org> wrote:
> With my CXY08-M [M3119-YA] (in a VAX4000/500) I
> luckily recieved the cables
> that went with it. They are BC19N-12s
> ("centronics-style" 50-pin male to 4
> DB-25 male). I could buzz them out for a pinout if
> you'd like, but these are
> apparently the wrong cables for yours as each has
> only 4 ports instead of 8.
> I suspect the difference (being lazy -- not looking
> up specs) is that the
> CXY08 has modem control.
>
> Sincerely,
> Chris Craft, RetroComputing Nut.
>
> On Monday 21 October 2002 16:30, Brian Chase wrote:
> > I've got an early MicroVAX 3100; one of the ones
> that just reads
> > "MicroVAX 3100" across the front. On the back of
> the system there are
> > three MMJ serial ports identified as 1-3, there's
> an DB-25M port which
> > I'd imagine is serial port 0 (the console), and
> beneath that is a
> > 36-pin Centronics style connector labelled 4-11
> with the DEC serial
> > port pictograph beneath it. I'd gather this is
> for some sort of serial
> > port cable "octopus."
> >
> > Does anyone have a spare one of these cables or a
> part number for
> > this cable? Thanks.
> >
> > -brian.
=====
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Received on Tue Oct 22 2002 - 22:22:00 BST