> The Pi’s A and B naming scheme for instance harks back to the Beeb B. And, in fact, the BBC Model A. As with the Pi models, the biggest difference between t

> The Pi’s A and B naming scheme for instance harks back to the Beeb B. And, in fact, the BBC Model A. As with the Pi models, the biggest difference between the BBC computer models A & B was RAM: the A having 16KiB and the B 32KiB. There were other differences too, but these were not as significant to many: a particular chip that provided IO, and the external ports that cam with it, were only available on the B or an user-upgraded A, and this also provided a couple of timers that one or two bits of software used (so there was some software that was model-B only despite fitting in the smaller RAM of tjhe model-A).