>         With an old 2400 baud modem on my "COM2" port, as MS-DOS would call
> it, I have tried "tip com2" and "cu -l /dev/tty01" (com2 is configured in
> /etc/remote) and received the errors "Device not configured" and "Line in
> use" repetedly.

Remember that NetBSD is different from DOS because it starts counting c
ports from 0.  Thus, com0 refers to COM1:, com1 to COM2: and so forth.