On Jul 13, 20:23, Tony Duell wrote:
  Over here, I'd recoment getting a BBC Micro.
It's got one main
 disadvantage compared to the Apple ][ -- no expansion slots. The plus
 points are : 
[snip]
I'll add the one point I'm surprised that Tony, of all people, missed :-)
It's well documented; the circuit diagrams are readily available, the
service manual is reasonably easy to find, and includes circuit
description, upgrade instructions, schematics, board layouts, mechanical
drawings, etc.  And other documents cover the systems calls in detail, how
to build interfaces to the bus, how to write ROM software for it, and so
on.
--
Pete                                            Peter Turnbull
                                                Network Manager
                                                University of York