<Is there a socketed PLCC chip in the middle of the board? (the so-called <GIME chip). If so, it's a 3. Yes there is. <The disk controller is basically a WD1773 + support circuitry. And a ROM <containing the disk extensions to basic. Not trivial to build, but not <impossible. You might find a second hand one somewhere. The FDC is easy as I have 1793 and 8229(glue chip). The rom is a show stopper. I'll have to keep an eye open. Allison