ae6502 is a toolkit for MOS 6502 processor emulation and development: a cycle-precise emulator and an assembler, living together in one TypeScript monorepo. An educational project, in the spirit of the community that keeps this 1975 CPU alive.
Features
- Cycle-precise emulator with accurate instruction timing
- Configurable memory mapping
- Assembler for 6502 source
- Test suite wired into GitHub Actions
Tech
- TypeScript end to end
- pnpm workspaces for the monorepo
- GitHub Actions for CI
What I learned
- Cycle accuracy on the 6502: page-boundary penalties and the cost of being exact.
- Writing an assembler: tokenizing, addressing modes, and label resolution.
- Structuring a TypeScript monorepo with shared tooling.
Links