Re: Emulated peripherals
Now there is an ironic circle.
The ARM instruction set was originally modelled on an Econet of BBC micros, and then the first ARM 1 development board was a Tube second processor!
Acorn really did have some exceptional engineers, and the BEEB was an exceptional system for it's time.
Incidentally, there were 80x86 (I think it was an 80286) second processors, as well as Z80 and even a NS32016 (originally intended to run Xenix) available as second processors. These were even packaged as business oriented machines as the ABC (Acorn Business Computer) range.