24 May
2002
24 May
'02
4:56 p.m.
My "new" Microvax 3100/90 has 4 serial ports, 3 MMJ's and one DB25-M. The
MMJ's are numbered 0, 1, and 3, and the DB25-M is labeled 2. I assume the
one labeled 0 is the console OPA0 port. There is a big yellow sticker above
the ports that says "0 OPA0" but it has a big arrow pointing to the RIGHT.
(the ports are numbered 0, 1, 3, 2 from left to right). This sticker seems
to be really odd.
My MMJ cable should arrive Tuesday. I'm planning to connect to my PC serial
port and use a terminal emulator to control the console. I assume I need a
null-modem/crossover cable to go from my PC COM port to the MMJ jack...
Correct me if I'm wrong.
Does anyone know if it is possible to use the DB25-M port as OPA0 instead,
like you can on the VAXstations? My MMJ will be here on Tuesday, but if I
could use the DB25-M, I could get my machine up and running this weekend :)
- Bob
24 May
24 May
5:33 p.m.
On Fri, 24 May 2002, Bob Lafleur wrote:
My "new" Microvax 3100/90 has 4 serial
ports, 3 MMJ's and one DB25-M. The
MMJ's are numbered 0, 1, and 3, and the DB25-M is labeled 2. I assume the
one labeled 0 is the console OPA0 port. There is a big yellow sticker above
the ports that says "0 OPA0" but it has a big arrow pointing to the RIGHT.
(the ports are numbered 0, 1, 3, 2 from left to right). This sticker seems
to be really odd.
OPA0 is port 3, the rightmost MMJ.
My MMJ cable should arrive Tuesday. I'm planning
to connect to my PC serial
port and use a terminal emulator to control the console. I assume I need a
null-modem/crossover cable to go from my PC COM port to the MMJ jack...
Correct me if I'm wrong.
The MMJ cable is a crossover cable itself. You just need an adapter
to match up with the PC's serial port.
Does anyone know if it is possible to use the DB25-M
port as OPA0 instead,
like you can on the VAXstations? My MMJ will be here on Tuesday, but if I
could use the DB25-M, I could get my machine up and running this weekend :)
Not that I know of.
Doc
9:05 p.m.
On Fri, 24 May 2002, Doc wrote:
I'm pretty sure DOC is correct on this one. AFAIK you can't use anything
other than port 0 or 3 as the console.
[1] I think this should be 0, but could be 1.
-- Pat
On Fri, 24 May 2002, Bob Lafleur wrote:
Actually, this depends on the setting of the micro slide switch on the
back of it. One position (BREAK ENABLE, IIRC) uses MMJ0[1], and the other
position (BREAK DISABLE) uses MMJ3. Don't ask me why DEC did such an odd
thing.
My "new" Microvax 3100/90 has 4 serial
ports, 3 MMJ's and one DB25-M. The
MMJ's are numbered 0, 1, and 3, and the DB25-M is labeled 2. I assume the
one labeled 0 is the console OPA0 port. There is a big yellow sticker above
the ports that says "0 OPA0" but it has a big arrow pointing to the RIGHT.
(the ports are numbered 0, 1, 3, 2 from left to right). This sticker seems
to be really odd.
OPA0 is port 3, the rightmost MMJ. > My MMJ cable should arrive Tuesday. I'm
planning to connect to my PC serial
> port and use a terminal emulator to control the console. I assume I need a
I hope you have better luck than me. I've never had any luck in getting
an MMJ (RS-423?) console port to work right with a PC's serial port, but
it could just be my stuff....
null-modem/crossover cable to go from my PC COM port to the MMJ jack...
Correct me if I'm wrong.
The MMJ cable is a crossover cable itself. You just need an adapter
to match up with the PC's serial port.
Does anyone know if it is possible to use the
DB25-M port as OPA0 instead,
like you can on the VAXstations? My MMJ will be here on Tuesday, but if I
could use the DB25-M, I could get my machine up and running this weekend :)
Not that I know of.
9:30 p.m.
On Sat, 25 May 2002, Pat Finnegan wrote:
I hope you have better luck than me. I've never
had any luck in getting
an MMJ (RS-423?) console port to work right with a PC's serial port, but
it could just be my stuff....
I've found that not all MMJ-DE9 or -DB25 adapters are created equal.
I think some reverse the null so you can attach a modem. (Novel
concept, I know.) I also think that there's some other, um, weirdness
involved. My 11/93's console is DB25, as is the Altos 580, and I use a
VT420 on both. They take different MMJ-DB25 adapters. I picked up a
handfull of 3rd-party 25-pin adapters awhile back, and they are not all
the same, so I haven't been motivated to pinout the difference.
Usually when I'm having terminal emulator problems, it's either the
modem control settings or the speed. But since the VTx20s are more
portable than my PC, I haven't fooled with it much in a long time.
Doc
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5 comments
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participants (4)
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allain＠panix.com -
bob_lafleur＠technologist.com -
doc＠mdrconsult.com -
pat＠purdueriots.com