[Elecraft] K3 - Macbook Pro

[Mike]

I've been using AFSK A for RTTY and PSK. I got a MacBook Pro yesterday, and it has 
only 1 audio jack, which may be either input or output. I'll be running Win7 in 
Parallels for my ham stuff.

Is there an external sound card that will work? I found one, but it requires external 
power.

How about serial ports? Will USB/serial converters work?

What's your solution?

I'd love to talk to any Mac programmers out there, off list.

73, Mike NF4L