[Info-vax] RX4640 and lost MP passwords

[Joukj]

Hi all,

I have got an RX4640 for which I do not know the MP passwords. I would 
like to reset them to default values

Somewhere I found you needed 2 steps:
   1. connect to the (serial) console
   2  execute the command
           stty +resetGSP

However, I have no idea how to connect to the (serial) console. Whgen I 
use a serial line into the machine It just asks for username/password
On the VGA console I get all the boot-options and the EFI-shell

How should I connect to this console?

                 Regards
                      Jouk