OK,
I downloaded the 2.0 sch. and will build that while the elm 322 chip is on its' way. The 9.1 transistor you refer to,did you mean the 9.1v zener (D3 1N5239)? I think I already have one of those and I know I have all the other parts on hand. I will order their obd cable.

Good pics,thanks, that's what I'm going to do.

"On the ELM322 there is a mode called "Monitor All." Launch hyperterm and turn this mode on. Then hit the buttons you are interested in; any data on the line will show up in hyperterm. "

That, I think, is basically what I did with the Fogsoft program this morning but I didn't understand the output from it. It's on the other old laptop and I'll post it here later on.

I'll get the data sheets and start studying them. Thanks, this is all vey much appreciated ! I can't wait to get this working.