Now the Gigatron is emulating a 6502 processor, the same CPU found in the Apple II and almost every other retrocomputer that isn’t running a Z80. There’s a thread over on the Gigatron forums ...

There were several commercial co-processors for the Tube, including ones with a 6502, a Z80 allowing CP/M to be run, and an 80186. As with most of the 8-bit generation of home computers the BBC ...