Hi, You might've already tried this, but on Apple's site you can search the Tech Info Library Archives for older product info: http://til.info.apple.com/tilarchive.nsf/Web+Search+Simple If you do a search for Macintosh AND 128k it turns up a bunch of articles, some with fairly technical info (pinouts and such). Good luck, -- MB --- "John Lewczyk" <jlewczyk(a)his.com> wrote: I've recently acquired one 128K and one 512K Macintosh and am looking for technical documentation on it (schematics, logic diagrams of pc boards). I thought that it would be easy to find on the web, but I've had no luck after more than a week of searching. Any help with schematics or service manuals would be appreciated. I've found some pdf files that have some rudimentary diagnostic procedures: "if the logic board is bad, replace it" "if the floppy drive is bad, replace it". The 128K's floppy isn't working, even after cleaning the coagulated lubricant and I am trying to diagnose the problem. Thanks! John jlewczyk(a)his.com --- end of quote ---