chip8-emulator
Another Chip8 emulator
#Registers
Special Registers
16 general purpose 8-bit Registers :
- V0
- V1
- V2
- V3
- V4
- V5
- V6
- V7
- V8
- V9
- VA
- VB
- VC
- VD
- VE
- VF
Register I
16 bit register used to store memory address. Only the 12 lowest are used
Instructions
CHIP-8 has 35 opcodes big-endian, each instruction has exactly two bytes.
| Opcode | Assembly command | Explanation |
|---|---|---|
| 1NNN | JUMP | Jump to the adress NNN |
| 2NNN | CALL | Move the PC to the address NNN |
| 3xNN | IF_EQ | If Vx == NN skip the next instruction |
| 6xNN | LOAD | Load the value NN into register Vx. |
| 8xy0 | LOAD | Load the value of Vy into register Vx. |
| ANNN | I | The interpreter puts the value nnn into register I. |
| CxNN | RAND | The interpreter picks a random number from 0 to 255, performs a AND with the numberNN then stores it in the register Vx |
| DxyN | DRAW | Draw the sprites at position (Vx, Vy) from register I until count n |