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It worked!
I used three wires from an old floppy drive ribbon connector to solder to the contacts on the board. I hooked these up to a 1.8v usb to serial adapter. Used minicom on my mac to do the work. 115k 8n1 No hard/soft flow control are the correct settings. I keep seeing 8n2 posted around but I know for sure that 8n1 works. Haven't thought about that stuff since my US Robotics 9600 baud modem days.
What I learned:
1) Soldering these connections is quite difficult (and I'm an electrical engineer) - they are very small, close together and it would be easy to pull the little solder beads off the contacts if you put tension on the wires. I used some electrical tape to hold my floppy ribbon to the board. Don't forget to precoat your wires with solder before you attach them to the board.
2) After hitting a key within one second to bypass the normal boot process you need to exit to a prompt. Here you do need to login with root and the "fiona" password generated by the python command posted elsewhere.
3) After this, it is quite simple to dd the two images. I used the 5.4.0 images that ixtab hosts.
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