Microvax 3100/90 OPA0

From: Doc <doc_at_mdrconsult.com>
Date: Fri May 24 21:33:40 2002

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
Received on Fri May 24 2002 - 21:33:40 BST