BBC Model B+128K The BBC Model B +128K was the final model, it squeezed every last bit of memory out of an 8-bit computer. It was launched in 1984 shortly after the BBC Model B+64K and was soon replaced by the BBC Master. Extensions The "Tube" was an expansion port which was designed to connect other processors to the BBC (6502, Z80, 68000 or ARM 1 RISC). Interface cards were specially designed for the tube. For instance another 6502 with 64K of RAM or a Z80 cpu also with 64K of RAM and CP/M 2.2 as operating system. Acorn used the name CPN for CP/M obviously for a trademark reason.
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