OK, I've given up trying to get my homebrew Visor serial connector working. I've got three unused sets of MAX232 chips and hotsync connector plastics I might as well unload. These are the "hard to find" parts for Visor serial port hacking... the rest you can get at Radio Shack. I'll throw in the RS232 (DB25, or DB9 if I have any in my box of tricks) connectors and the Radio Shack perfboard* and sell them for $10.00 each set, including shipping in the US. If you want to experiment more aggressively, I have a couple of breadboards I could add for $5.00 (first come, first served)

* The ones recommended on the web page.