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A free book dissects the 6502 and 68K assembly code behind Atari’s 1981 Tempest and Jeff Minter’s 1994 Tempest 2000, chapter-by-chapter.
Soul Player C64 implements a real 2-layer decoder-only transformer with ~25,000 int8 parameters in hand-written 6502/6510 assembly, running entirely on an unmodified 1 MHz Commodore 64 loaded from a floppy disk. The project includes training scripts to build and quantize custom models, assemble C64 binaries, and run inference at roughly 60 seconds per token.