what happened to /dev/cuaa0

[KHOO Guan_Chen]

I installed FreeBSD 6.0 on an old compaq 500 desktop a few weeks ago 
and am now interested in connecting to the internet with dial up 
modem.  But when I gave the command pppd (as root), I got the error 
"unregnized option /dev/cuaa0". Sure enough I could not find 
/dev/cuaa(0,1). I could only find /dev/cuad(0,1) Changing to 
/dev/cuad0 in my options file was not help

Could some kind soul tell me what to do.

Thanks alot

Richard KHOO Guan Chen