Phill Harvey-Smith <afra at aurigae.demon.co.uk> writes:
Though I believe that the hardware of the ZX80 can be
modified to
support this.
Yep. Grant Searle's site has an excellent description of how to build
your own ZX80 from scratch, and the extra logic to convert a ZX80 into a
ZX81:
http://home.micros.users.btopenworld.com/
(He's also got homebrew versions of the Jupiter Ace and UK-101, among
various other interesting bits.)
--
Adam Sampson <ats at offog.org> <http://offog.org/>