> > How close a derivative? If the pinouts are the same it'd make life much > simpler for you to grab a 7747 from the boneyard. Then you could hack away > at the 7429 at your leisure. Yeah, I've come to that conclusion... I'm the type that needs to bite off more then I can chew. I did find the main spark and VE tables though! I've got the phone book out now... Ernst