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The Visual 6502
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C64 (Commodore) - Console approach - 8Bit
The designers figured that you'd use X and Y for looping, indexing etc, and use A for adding and subtracting, shifts etc. So they saw a need for INX and INY, but didn't see a enough of a need for an instruction to increment or decrement the accumulator.
6502asm.com v1.2 - World's first fantasy console!
The Visual 6502
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The Visual 6502