Just following up - according to another thread on this same site, the PL2303 chips are really an RS232-like connection, NOT TTL like FTDI is. Oh well. I'm only out $6.
...

Hey has anybody tried the new integrated chip + USB cables that are for sale on Ebay now? If these work right, all you have to do is wire them up to your OBD1 ALDL plug and you're good to tune, or...

Thank you Robert - I had success with multiple writes and reads. No more risk! I appreciate all of the work that went into this!

Can one of you doublecheck my settings? I just completed a benchtop programming setup for '94-95 LT1s and I want to make sure I have all of the driver settings correct. I've done a successful...