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SectorC is a C compiler written in x86-16 assembly that fits within 512 bytes of a boot sector. It supports a subset of C including global variables, functions, if/while statements, operators, pointer dereference, and inline machine code. The compiler uses space-delimited tokens and treats atoi() as a hash function to minimize the tokenizer. Through aggressive optimization techniques like tail-calls, call-fusion, and efficient instruction encoding, the implementation shrunk from 468 to 303 bytes, leaving room for additional features. The project includes a runtime library and example programs that demonstrate VGA graphics, PC speaker audio, and direct hardware access.

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