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/ swiss vintage comput... / Vintage computing / Historical Computing / Hardware / Hardware based on pr... / 6502 / The designers figure...
> 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.> 6502> Hardware based on processors

@MauryMarkowitz There are a lot of instructions that could be added to the 6502 to decrease code size and/or increase performance but werent. The designers were trying to make a cheap microprocessor, not a fully featured one and they drew their line with

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.
 
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