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Machine code
From SnesLab
Machine code (or machine language, native code) is the native language of a computer processor (for SNES ROM hackers, that processor is usually the 65c816, but it could be the SPC700).
It is possible, though difficult, for humans to read and write machine code. However, it is almost always a better idea to read and write assembler code (or ASM for short), and use an assembler to convert that to machine code, and use a disassembler to convert machine code back to assembler code.