A CHIP-8 emulator in Javascript and p5.js(a great Javascript canvas library). Because of its simplicity, it is usually recommened as a first emulator one should try before going on to build complicated ones (though it is not necessary). I thought it would be fun so I decided to take on this project. It was cool and I totally enjoyed the process. You can even play pong and tetris on it 😃 . Try it out. Visit https://amosaidoo.com/chip8 to see the emulator in action.
CHIP-8 has 35 opcodes, which are all two bytes long and stored big-endian.
NNN: address
NN: 8-bit constant
N: 4-bit constant
X and Y: 4-bit register identifier
PC : Program Counter
I : 16bit register (For memory address) (Similar to void pointer)
VN: One of the 16 available variables. N may be 0 to F (hexadecimal)
Please check the chip-8 wikipedia page for the meaning of the opcodes.
| Opcode | Implemented |
|---|---|
| 0NNN | ❌ |
| 00E0 | ✅ |
| 00EE | ✅ |
| 1NNN | ✅ |
| 2NNN | ✅ |
| 3XNN | ✅ |
| 4XNN | ✅ |
| 5XY0 | ✅ |
| 6XNN | ✅ |
| 7XNN | ✅ |
| 8XY0 | ✅ |
| 8XY1 | ✅ |
| 8XY2 | ✅ |
| 8XY3 | ✅ |
| 8XY4 | ✅ |
| 8XY5 | ✅ |
| 8XY6 | ✅ |
| 8XY7 | ✅ |
| 8XYE | ✅ |
| 9XY0 | ✅ |
| ANNN | ✅ |
| BNNN | ✅ |
| CXNN | ✅ |
| DXYN | ✅ |
| EX9E | ✅ |
| EXA1 | ✅ |
| FX07 | ✅ |
| FX0A | ✅ |
| FX15 | ✅ |
| FX18 | ✅ |
| FX1E | ✅ |
| FX29 | ✅ |
| FX33 | ✅ |
| FX55 | ✅ |
| FX65 | ✅ |