Back To The Roots seems OK here - note the URL isn't "backtotheroots.org":
http://www.back2roots.orgAnd as for the A1000 and A500 having PCMCIA - that'd be difficult as both of them pre-date even the earliest PCMCIA standard!
Electrically, it's a simple enough connection so it's not beyond the realms of possibility to add it to an early Amiga given sufficient electronics and software skills, neither of which I've got at the required level!
- Ali
