Serial Ports are there, but not in /dev

[Dr. Lyman Hazelton]

I have a pair of standard serial ports which show up in dmesg thus:

sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 flags 0x10 on isa0
sio1: type 16550A

However, they don't show up as devices in /dev.  Anyone have some idea 
why the system might not like them, and how I can get them to show up 
as devices?  I have a serial PalmPilot (actually, a Kyocera phone) 
I'd like to be able to use with KPilot.