65816

The WDC 65C816 — the SNES CPU: 16-bit A/X/Y toggled by the M/X flags, 24-bit addressing, bank-relative code. The 6502’s big sibling; a disassembler must track M/X width to decode immediates.

• Breaking Down an SNES Cart — the teardown method — why the NES 6502 disassembler does not transfer as-is; RESET vector as the entry point
• SNES teardown — snes-decompiler — the substrate that will host an M/X-width-aware 65C816 disassembler when a target lands
• Nobunaga’s Ambition (SNES) compiled to native 65816 — a KOEI title compiled straight to native 65C816 (compiler-generated cdecl: PEA/JSL/PLA); drove a native 65816→C decompiler + a 32-bit mul/div lib finding
• NA1 NES↔SNES — grading two blind reverse-engineerings — SNES-derived vs NES-derived, all 5 sections converge (record bytes, Grow formula, event cadence, weakest-neighbour AI, 8-stat combat table); create-then-check method
• Arithmetic as a Purchase — Sixty Years of Paying for Multiply — the 65C816 has no multiply instruction, so the SNES supplies one as MMIO ($4202/$4203 → $4216, 8 cycles vs ~80 in software) using the same port protocol as Atari’s 1980 math box
• Gemfire (SNES) — The second KOEI SNES title reversed — and the pass that exposed the trampoline bug in
• ROTK2 — Sangokushi II (SNES) — The first KOEI SNES title reversed, and the title that proved the portable VM from both sides.
• SNES system tools — snes-decompiler — The target-agnostic substrate for taking apart any SNES cart: 65C816, LoROM/HiROM detection,