Don't know if you'd be interested in this, but I have designed and built an ALDL interface adapter that works with a PC (standard serial interface). I have tested it with WinALDL, PCMCOMM, TurboLink, etc. and it works great. This unit was originally built for the 85-88 V6 Pontiac Fiero. I have also got it to work with the 3800SC engine that is a popular swap with the Fiero community.
Here's more info:
http://www.meisners.net/aldl
Steve