nesgo

NES-GO

Another NES Emulator implemented in Golang

Dependencies

MacOS

brew install glfw
brew install portaudio

Linux/Unix Based Systems or Windows

Refer to https://www.glfw.org/ And http://www.portaudio.com/

Usage

go run cmd/nesgo/main.go <path-to-rom>

Key bindings

Currently the keys are statically mapped, dynamic mapping through a configuration file will be supported in the future. Only the first controller is supported.

Controller 1 (keyboard)

• A - N
• B - M
• Up/Down/Left/Right - WSAD
• Start - Enter
• Select - Backspace

Special keys

• E - enable/disable emulation
• L - enable/disable disassembler in stdout
• Space - Step one frame
• O - Cycle through: PPU rendered output - Pattern table 1 - Pattern table 2
• P - Cycle through palette index 0-7 (when showing pattern tables)

Progress:

• - CPU implementation
• - Basic cartridge / mapper implementation
• - GUI framework: glfw/gl
• - Basic controller support
• - PPU background rendering
• - PPU foreground rendering (sprites)
• - Framework for audio
• - APU (audio processing unit)
• - Multiple controller mappings
• - Dynamic controller mapping
• - Save state
• - Battery support
• - More mappers... (contributions are appreciated)

Notes:

• The code is set up as simple as possible, depicting all steps in emulation, specially when rendering the image in the PPU, optimisations are omitted intentionally

References:

• http://wiki.nesdev.com/w/index.php/Nesdev_Wiki
• http://archive.6502.org/publications/pet_paper/pet_paper_v3_i2_i3.pdf
• https://www.cs.otago.ac.nz/cosc243/pdf/6502Poster.pdf