COM3/COM4 on XENIX 2.3.3

[Tom Kimball]

Does anyone know the secret of getting COM3 (and COM4) to work
under SCO Xenix 2.3.3?  I did the "mkdev serial" bit and made
my /dev/tty3a and /dev/tty3A devices, but the bootup messages
says only 2 serial ports are recognized.  I setup my COM3 to use IRQ5
(where do you tell Xenix this?).  I also tried moving "../io/vpixio.a"
to the last item in link_xenix, and rebuilt the kernal.  Still
no luck. (Yes I have VPIX installed).

Thanx for any help.
Tom Kimball