Therefore it's probably as easy to start with a
bare CPU chip...
Maybe, but then you have to make a board, and at least a ZX
compatible edge connector for all the great perhipherals ...
So after all, using a ZX81 is just a cheap way to get exactly
this.
Well, if you're going to make an external keyboard, LCD interface,
digitiser, etc, then you're going to have to make some boards as well.
Might as well just stick the Z80 on one of them.
That's true but I think they just enjoy seeing who can hang the most
stuff off of a ZX81. Sort of like the guys that see who can put the biggest
engine inside a Chevy Vega!
Joe