C3000 Serial Port One Way? Options

[papercrane]

I'm attemting to use the serial port (Sharp port with a SerialIO serial cable) as a serial terminal. To test I started up minicom on both my z and PC and set the baud rates and such the same. When I type on the PC nothing happens. When I type on the Z I see what I typed displayed on the PC. I've tried playing with the settings on both ends and I can't get data from the PC to show up on the Z.

I can see three possibilities.
1) The serial port is one way. (I hope this isn't it....)
2) I'm setting something up wrong. (Entirely possible)
3) The serial port is set up as one way by the kernel.

I tend to think it's option 3 as when I rebooted my Z while the serial cable was connected I got kernel/boot output (but only until the sceen came up). One of the lines output is:

CODE

COMMANDLINE= console=ttyS0 root=/dev/mtdblock2 mtdparts=sharpsl-nand:7168k@0k(smf),5120k@7168k(root),-(home) jffs2_orphaned_inodes=delete EQUIPMENT=4 LOGOLANG=1 DEFYEAR=2005 LOGO=1 LAUNCH=q

Anyone have any ideas?