6502 machine language

6502 machine language is a low-level programming language that maps 1-to-1 to the instruction set of the MOS 6502 microprocessor. Programmers usually write their code in 6502 assembly and then compile it into 6502 machine language to run on the chip, however, if you're working with compiled programs, you usually have to work directly in the machine language. With only around 50 opcodes, the 6502 is a RISC architecture.

Personal

In my desire to hack NES games more effectively, I started delving into 6502 machine language. While I am by no means a competent 6502 programmer, I know enough about the chip to perform basic hacks to existing programs. I did a fair amount of work writing about the language for my ROM Detectives web site.

Media

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  6502 Assembly Language Programming by Fernandez, Tabler, and Ashley.

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  6502 Assembly Language Programming by Leventhal.

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  Assembly Lines: The Book.

Links

• 6502.org - The 6502 Microprocessor Resource.
• skilldrick.github.io/easy6502 - An online 6502 emulator.
• romdetectives.com - ROM Detectives.