Approaches to projects (was: KM11 maintenance module

I don;'t have a single PC-compatible laptop. I've got a Tandy M100, a handful of Epson HX20s and a PX4, an HP110 and a couple of Portable Pluses..... I do use them, but I don't think any are particularly suitable for making a KM11 clone. Incidentally, if you use a laptop to make a KM11 clone, presumably you need some hardware to link it to the KM11 slot on the DEC backplane. I can't believe that's the sort of thing that's thrown out by your neighbour (or, indeed, is as easy and cheap to obtain as a few buffer chips). What's this love of the ZX81, which I regard as a postively horrible machine. I'd not rip one apart, though, mainly because there's little of use to raid from it... I've only got one, and I'm hanging on to it. I happen to like Forth (and RPN in general). -tony