The BBC Micro
The BBC Micro was launched to coincide with a computer literacy drive by the BBC. The machine had possibly one of the best versions of BASIC out of all of the computers at the time and also had good expansion capabilities including networking (Econet), a disc interface, and a second processor.
Model BAs the Model A, with the following changes:
Model B+As the Model A, with the following changes:
Info taken from http://www.freeflight.com/fms/comp/sys/Acorn.html