nes-skills

Write, read, debug, and optimize 6502 assembly language code. Use this skill whenever the user asks about 6502 assembly, MOS 6502, 6510, 65C02, or 65C816 programming, or is working on projects for the NES, SNES, Commodore 64, Apple II, Atari 2600/8-bit, VIC-20, BBC Micro, or any other 6502-based platform. Also trigger when the user mentions opcodes, addressing modes, zero page, stack operations, or assembly language concepts in the context of 8-bit/retro computing. Covers instruction set, addressing modes, common algorithms (16-bit math, multiplication, division), memory layout, optimization, and platform-specific patterns. Even if the user just says "assembly" in a retro computing context, use this skill.

iNES, NES 2.0, and UNIF ROM format reference. Use when reading, writing, parsing, or debugging .nes/.unf ROM files, or handling NES ROM headers.

Write and run FCEUX Lua scripts for NES ROM automation — screenshots, PPU memory dumps, automated input, code execution tracing, and API discovery. Use when the user wants to automate FCEUX, capture ROM data, dump CHR/nametable/palette, trace code execution, or script NES emulation tasks. Triggers on mentions of FCEUX, Lua scripting for NES, ROM analysis automation, ppu.readbyte, memory.registerexec, gui.savescreenshotas, joypad.set.

Disassemble retro ROMs (NES, CHIP-8) into bit-perfect reassemblable assembly with retrodisasm. Use when the user wants to disassemble a ROM, reverse-engineer NES code, inspect ROM internals, batch-process ROMs, verify reassembly, or convert binaries to assembly source.