![]() ![]() 6502's indirect addressing modes or the Z80's H/L registers). ![]() All successful "8 bit" CPUs implemented 16 bit addressing, for example (often via odd hacks to make up for the lack of a single address register, c.f. The size of the address bus is almost never the defining factor. ![]() They were usually marketed as "16 bit" CPUs at the time. The Motorola 6800 CPUs implemented a 32 bit register set, but did it via microcode on top of a mostly 16 bit internal architecture. So the PDP-10 was a 36 bit machine, a 8080 was 8 bit, and a IBM 360 or Intel 80386 is "32 bits".īut there are exceptions. Broadly, as xtofl points out, it's the size of the atomic unit of computation (in early computers, this wasn't always synonymous with "register"). ![]()
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