🎮 CHIP-8 Emulator

A high-performance CHIP-8 emulator written in Go, featuring pixel-perfect graphics rendering and authentic sound emulation. Experience classic 8-bit games exactly as they were meant to be played!

✨ Features

• 🎯 Complete CHIP-8 instruction set - All 35 opcodes implemented
• 🖥️ Pixel-perfect display - Authentic 64x32 monochrome graphics
• ⌨️ Intuitive keyboard mapping - Modern QWERTY layout support
• 🎵 Configurable audio - Built-in beep sound system with volume control
• 🚀 High performance - Configurable CPU cycles at 60 FPS
• 🎮 Game compatibility - Supports classic CHIP-8 ROMs
• 📦 Cross-platform - Runs on Windows, macOS, and Linux

🛠️ Installation

Prerequisites

• Go 1.24.5 or later
• Git

Quick Start

# Clone the repository
git clone https://github.com/azraelsec/chip-8.git
cd chip-8

# Build the emulator
make build

# Run a game
./chip-8 -rom-path roms/pong.c8

🎮 Usage

Command Line Options

./chip-8 [OPTIONS]

Options:
  -rom-path string
        path to the rom you want to emulate (required)
  -cycles-per-update int
        number of cycles to run per update (default 10)
  -volume float
        audio volume (0.0 to 1.0) (default 0.7)

Basic Examples

# Play Pong with default settings
./chip-8 -rom-path roms/pong.c8

# Play Space Invaders
./chip-8 -rom-path roms/invaders.c8

# Play Breakout
./chip-8 -rom-path roms/pong.ch8

Advanced Examples

# Run with custom volume (quiet)
./chip-8 -rom-path roms/pong.c8 -volume 0.3

# Run with faster CPU cycles
./chip-8 -rom-path roms/pong.c8 -cycles-per-update 15

# Run with custom volume and CPU cycles
./chip-8 -rom-path roms/invaders.c8 -volume 0.5 -cycles-per-update 12

# Run silently (no audio)
./chip-8 -rom-path roms/pong.c8 -volume 0.0

Keyboard Controls

The CHIP-8 keypad is mapped to your keyboard as follows:

CHIP-8 Keypad    Your Keyboard
┌─┬─┬─┬─┐        ┌─┬─┬─┬─┐
│1│2│3│C│   →    │1│2│3│4│
├─┼─┼─┼─┤        ├─┼─┼─┼─┤
│4│5│6│D│   →    │Q│W│E│R│
├─┼─┼─┼─┤        ├─┼─┼─┼─┤
│7│8│9│E│   →    │A│S│D│F│
├─┼─┼─┼─┤        ├─┼─┼─┼─┤
│A│0│B│F│   →    │Z│X│C│V│
└─┴─┴─┴─┘        └─┴─┴─┴─┘

🏗️ Architecture

The emulator follows a clean, modular architecture:

pkg/
├── chip8/          # Core CHIP-8 system implementation
└── emulator/       # Ebiten game engine integration

internal/
├── audio/          # Audio system and beep generation
├── cpu/            # CPU registers and stack management
├── display/        # Graphics buffer and rendering
├── keys/           # Input handling
└── ram/            # Memory management and font data

🎯 Technical Specifications

• Memory: 4KB RAM (0x000-0xFFF)
• Display: 64x32 pixels, monochrome
• CPU: 16 8-bit registers (V0-VF)
• Stack: 16 levels for subroutines
• Timers: 60Hz delay and sound timers
• Clock Speed: ~540 Hz (configurable via -cycles-per-update)
• Audio: 440Hz sine wave beep with configurable volume

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

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Built with ❤️ in Go