nes

Files about the Nintendo Entertainment System / Famicom — 2A03, PPU (2C02), APU, mappers, and the games written for them.

• NES Research — platform overview; 2A03 vs 6507 comparison; the storytelling-vs-logic axis
• PPU Reference — Picture Processing Unit (Ricoh 2C02): registers, NMI, OAM, scrolling, frame timing
• APU Reference — Audio Processing Unit: 5 channels, envelope/sweep/length-counter autonomy
• Mappers Reference — NROM through MMC5; what cartridge logic enables
• Game Annotation Series — moved to standalone repos
• KOEI AI & combat evolution (5-decompiler study)
• L’Empereur — the two-tier turn (NES→SNES design hinge)
• Arithmetic as a Purchase — Sixty Years of Paying for Multiply — the MMC5 as math coprocessor ($5205/$5206), confirmed in use across the vault’s decompiled KOEI ROMs; divide stayed in software
• Bandit Kings of Ancient China (NES) — Game 6 in the KOEI NES decompiler family — decompile order, not release order.
• Gemfire (NES, 1992) — Game 7 in the KOEI NES decompiler family (decompile order, not release order — L’Empereur is
• Genghis Khan (NES) — Design clock 1987; Famicom port 1989-04-20.
• KOEI tools — the shared engine toolchain — Tools node, not a title index. One studio, one bytecode-VM engine lineage, two consoles.
• L’Empereur (NES, 1991) — Game 8 in the KOEI NES decompiler family.
• NA1 — Nobunaga’s Ambition (NES) — The bytecode-VM decompiler that outgrew annotation and became the series’ crucible.
• NES / Famicom — system node — The 6502 + PPU substrate and every title decompiled on it.
• NES system tools — rendering & emulator integration — The target-agnostic NES tooling: rendering, and Mesen (emulator) integration.
• ROTK1 — Sangokushi (NES) — The earliest title in the KOEI NES decompiler family, and the baseline the other four are read
• ROTK2 — Sangokushi II (NES) — Design clock 1989; Famicom port 1990.
• The comparison studies — paired deep-reads — The four titles the series started as, organized in paired comparisons.