OCamNes

Yes. Yet another NES Emulator. Built in OCaml.

Currently passes the Nestest suite up to unofficial opcodes.

Controls

NES Controller	Keyboard
Up	Up
Down	Down
Left	Left
Right	Right
A	Z
B	X
Start	Return
Select	Left Shift
Quit	Q
Screenshot	S
Debugger	'

Games running mostly glitch-less:

• Super Mario Bros
• Donkey kong
• Balloon fight
• Lode runner
• Contra
• Gradius

How to build

• dune build
• opam install . --deps-only
• dune exec ./bin/main.exe

Debugger Controls

Key	Action
s	Step
c	Continue
q	Quit
bp	List breakpoints
bp add a	Add a breakpoint at address a
bp del a	Delete a breakpoint at address a
byte a	Print byte at address a
byte a b	Print bytes from a to b
word a	Print word at address a
ppu a	Print PPU VRAM or Register at a
ppu a b	Print PPU VRAM or Register from a to b
pputrace	Print PPU internal registers (t, v, x)
oam	Print OAM data

TODO

• Support more mappers (only NROM/UxROM/CNROM are supported)
• PPU Special flags to stop rendering sprites at the edge
• IRQ (Not sure if they're used anywhere)
• APU (No sound for now)
• Second controller support
• Unofficial opcodes
• Load/Save state
• Better debugger and logging
• Remap controls