A CHIP-8 Emulator in Kotlin Multiplatform targeting the JVM and JS
https://lpicanco.github.io/chip-8-emulator/
| Instruction | Description |
|---|---|
00E0 |
Clears the screen |
00EE |
Returns from a subroutine |
1NNN |
Jumps to address NNN |
2NNN |
Calls subroutine at NNN |
3XNN |
Skips the next instruction if VX equals NN |
4XNN |
Skips the next instruction if VX doesn't equal NN |
5XY0 |
Skips the next instruction if VX equals VY |
6XNN |
Sets VX to NN |
7XNN |
Adds NN to VX without changing the carry flag |
8XY0 |
Sets VX to the value of VY |
8XY1 |
Sets VX to VX OR VY |
8XY2 |
Sets VX to VX AND VY |
8XY3 |
Sets VX to VX XOR VY |
8XY4 |
Adds VY to VX. VF is set to 1 when there's a carry, and to 0 when there isn't |
8XY5 |
VY is subtracted from VX. VF is set to 0 when there's a borrow, and 1 when there isn't |
8XY6 |
Stores the least significant bit of VX in VF and then shifts VX to the right by 1 |
8XY7 |
Sets VX to VY minus VX. VF is set to 0 when there's a borrow, and 1 when there isn't |
8XYE |
Stores the most significant bit of VX in VF and then shifts VX to the left by 1 |
9XY0 |
Skips the next instruction if VX doesn't equal VY |
ANNN |
Sets I to the address NNN |
BNNN |
Jumps to the address NNN plus V0 |
CXNN |
Sets VX to the result of a bitwise and operation on a random number (Typically: 0 to 255) and NN |
DXYN |
Draws a sprite at coordinate (VX, VY) that has a width of 8 pixels and a height of N+1 pixels. Each row of 8 pixels is read as bit-coded starting from memory location I; I value doesn’t change after the execution of this instruction. As described above, VF is set to 1 if any screen pixels are flipped from set to unset when the sprite is drawn, and to 0 if that doesn't happen |
EX9E |
Skips the next instruction if the key stored in VX is pressed |
EXA1 |
Skips the next instruction if the key stored in VX isn't pressed |
FX07 |
Sets VX to the value of the delay timer |
FX0A |
A key press is awaited, and then stored in VX. (Blocking Operation. All instruction halted until next key event) |
FX15 |
Sets the delay timer to VX |
FX18 |
Sets the sound timer to VX |
FX1E |
Adds VX to I. VF is not affected |
FX29 |
Sets I to the location of the sprite for the character in VX. Characters 0-F (in hexadecimal) are represented by a 4x5 font |
FX33 |
Stores the binary-coded decimal representation of VX, with the most significant of three digits at the address in I, the middle digit at I plus 1, and the least significant digit at I plus 2 |
FX55 |
Stores V0 to VX (including VX) in memory starting at address I. The offset from I is increased by 1 for each value written, but I itself is left unmodified |
FX65 |
Fills V0 to VX (including VX) with values from memory starting at address I. The offset from I is increased by 1 for each value written, but I itself is left unmodified |