go6502

A 6502 emulator, simulator, and assembler(s), written in Go.

This repository should probably be split up. It contains:

cpu

The actual 6502 CPU emulation.

TODOs:

• [ ] Implement 65C02 variant
• [ ] Implement undocumented instructions
• [ ] Profile and speed up

visual

A go transliteration of an old version of https://github.com/mist64/perfect6502, the gate-level simulation of the 6502.

TODOs:

• [ ] Incorporate recent speedups/simplifications made to perfect6502
  • [ ] main 25% speedup
  • [ ] de-dup transistors
  • [ ] bug fix
• [ ] Profile and speed up
• [ ] Write a ridiculous one-goroutine-per-transistor simulation

asm

A 6502 assembler, more-or-less compatible with several flavors of oldschool (and soon, modern) assemblers:

Oldschool:

• SCMA
• Merlin
• "Redbook" (A and B) the flavor used in some Apple source listings.

Modern:

• (in-progress) as65
• (todo) acme