nintengo

An NES emulator written in Go

Build

Mac OS X/Linux/Windows

1. Install Azul3D by following the official installation instructions for your platform.

2. go get -u github.com/nwidger/nintengo

WebAssembly

WebAssembly support requires Go 1.11 or higher.

1. Download nintengo

   go get -d -u github.com/nwidger/nintengo
   

2. Build wasm/nintengo.wasm

   cd $GOPATH/src/github.com/nwidger/nintengo
   GOOS=js GOARCH=wasm go build -o wasm/nintengo.wasm .
   

3. Start web server running on port 8000

   cd $GOPATH/src/github.com/nwidger/nintengo/wasm
   go run serve.go -http :8000
   

4. Open http://localhost:8000 in your browser. Press the Choose File button and select a .nes file to run.

Usage

nintengo OPTIONS FILE
FILE can be a .nes file or a .nes file inside a .zip archive
  -audio-recorder="": recorder to use: none | wav
  -connect="": Connect to address as slave, <rom-file> will be ignored (e.g., 'localhost:8080')
  -cpu-decode=false: decode CPU instructions
  -cpu-profile="": write CPU profile to file
  -http="": HTTP service address (e.g., ':6060')
  -listen="": Listen at address as master (e.g., ':8080')
  -mem-profile="": write memory profile to file
  -recorder="": recorder to use: none | jpeg | gif
  -region="NTSC": system region to emulate: NTSC | PAL

Controls

z - A
x - B
Enter - Start
Right Shift - Select
Arrow keys - Up/Down/Left/Right

p - Pause/Unpause
n - Toggle stepping by cycle/scanline/frame with p
r - Reset
q - Quit

F1 - save state
F5 - load state

F8  - 200% FPS (2x fast forward)
F9  - 100% FPS
F10 - 75% FPS
F11 - 50% FPS
F12 - 25% FPS

` - toggle overscan
1 - 256x240 screen size
2 - 512x480 screen size
3 - 768x720 screen size
4 - 1024x960 screen size
5 - 2560x1440 screen size

9 - Show/hide background
0 - Show/hide sprites

keypad 0 - toggle mute all channels
keypad 1 - toggle mute pulse 1 channel
keypad 2 - toggle mute pulse 2 channel
keypad 3 - toggle mute triangle channel
keypad 4 - toggle mute noise channel
keypad 5 - toggle mute DMC channel

l - Save pattern tables to left/right.jpg

o - Toggle CPU decoding
i - Toggle PPU decoding

with -recorder=gif:
s - Start recording to frame.gif
d - Stop recording

with -recorder=jpeg:
s - Save screenshot to frame.jpg

with -audio-recorder=wav:
keypad - (minus) - Start audio recording to audio.wav
keypad + (plus) - Stop audio recording

Support

Audio support is currently a work in progress. All audio channels are working in some capacity.

Battery backed saves is implemented and are saved to disk with a .sav file extension.

Save states are supported and are saved to disk with a .nst file extension.

Netplay

Nintengo includes two-player netplay support using the -listen and -connect command-line arguments. To use, player one launches nintengo and tells it to listen for incoming connections using the -listen flag:

nintengo -listen=:8080 FILE

Player two then connects to player one using the -connect flag, providing the server's host/port:

nintengo -connect=192.168.1.110:8080

Note that player two does not need to provide a FILE argument.

Mappers

• NROM
• MMC1
• UNROM
• CNROM
• MMC3
• ANROM
• MMC2

Acknowledgments

This project would not have been possible without the amazing treasure trove of information that is the NESdev Wiki and the fine folks at #nesdev on EFnet.

Being able to read the source code of other NES emulators was also extremely helpful. The following is a short list of the ones I consulted most often, although it is probably not the complete list:

• Fergulator: https://github.com/scottferg/Fergulator/
• Nintendulator: http://www.qmtpro.com/~nes/nintendulator/
• Nestopia: http://nestopia.sourceforge.net/
• Nesalizer (by Ulf Magnusson): https://github.com/ulfalizer/nesalizer