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The original Apple I / II before the Macintosh used the MOS 6502 processor.
by lizknope 5y ago
The original Apple I / II before the Macintosh used the MOS 6502 processor.
- colanderman 5y ago6502 is arguably a "proto-ARM", so one could say Apple has come full circle.
- colejohnson66 5y agoWhat do you mean “proto ARM”? I thought the 6502 was based on the MC6800 (the predecessor to the 68k)?
- Angostura 5y agoNo the 6502 was Chuck Peddle's baby - not related. It had a quite a nice simple instructions set.
- colanderman 5y agohttps://en.wikipedia.org/wiki/ARM_architecture#Design_concepts https://en.wikipedia.org/wiki/ARM_architecture#Design_concep... Parts of ARM were modeled after 6502, it having been the processor used in the company's first successful microcomputer.
- a1369209993 5y agoIt's arguably a proto-RISC architechture (eg ADD has to be coded explicitly from CLC and one or more ADC, register file is memory locations 00-FF, etc), but it has little to do with ARM.
- colanderman 5y agoMy understanding was that much of the design of ARM was literally based on 6502: https://en.wikipedia.org/wiki/ARM_architecture#Design_concepts https://en.wikipedia.org/wiki/ARM_architecture#Design_concep... Edit: Granted, Sophie Wilson, one of the designers of ARM, is on record stating that 6502 didn't inspire anything in particular, beside being one of the few inputs to her pool of ideas (16032 and Berkeley RISC being the others): https://people.cs.clemson.edu/~mark/admired_designs.html#wilson https://people.cs.clemson.edu/~mark/admired_designs.html#wil... So... arguably :)
- a1369209993 5y ago> My understanding was that much of the design of ARM was literally based on 6502 Huh, hadn't seen that previously. I'd still call that a influence on ARM rather than a proto-ARM, but fair enough.