@foone I’m saddened by all those that feel limited to just a couple serial ports. May I introduce the Digi SCSI Terminal Server, giving you an additional 8 serial ports off your SCSI bus. Of course, you can daisy chain 7 of them per bus. With a few dual port SCSI cards and a tall stack of cash, imagine the possibilities!
https://www.artisantg.com/TestMeasurement/46497-2/Digi-STS-1008-SCSI-Terminal-Server
Back in the day I think I had a 16+ port version of this that I used for remote access to Sun and HP servers via their serial consoles.