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> 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

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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

@MauryMarkowitz There are a lot of instructions that could be added to the 6502 to decrease code size and/or increase performance but weren't. 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.

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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