CHIP-8

CHIP-8 emulator in C++. POC for my Bachelor's Degree Thesis.

Opcodes

• 0x00E0: Clear screen
• 0x00EE: Return from subroutine
• 0x1NNN: Jump to location
• 0x2NNN: Call a subroutine at address NNN
• 0x3XKK: Skip next instr. if V[X] == KK
• 0x4XKK: Skip next instr. if V[X] != KK
• 0x5XY0: Skip next instr. if V[X] == V[Y]
• 0x6XKK: V[X] = KK
• 0x7XKK: V[X] += KK
• 0x8XY0: V[X] = V[Y]
• 0x8XY1: V[X] OR V[Y]
• 0x8XY2: V[X] AND V[Y]
• 0x8XY3: V[X] XOR V[Y]
• 0x8XY4: V[X] ADD V[Y]
• 0x8XY5: V[X] SUB V[Y]
• 0x8XY6: V[X] = V[X] / 2
• 0x8XY7: V[X] SUBN V[X]
• 0x8XYE: V[X] = V[X] * 2
• 0x9XY0: Skip next instr. if V[X] != V[Y]
• 0xANNN: I = NNN
• 0xBNNN: pc = NNN + V[0x0]
• 0xCXKK: V[X] = random byte AND KK
• 0xDXYN: Display n-byte sprite starting at memory location I (V[X, V[Y]), V[F] = collision
• 0xEX9E: Skip next instr. if key with value of V[X] is pressed
• 0xEXA1: Skip next instr. if key with value of V[X] is NOT pressed
• 0xFX07: V[X] = delay_timer
• 0xFX0A: Wait for key press, store value of pressed key in V[X]
• 0xFX15: delay_timer = V[X]
• 0xFX18: sound_timer = V[X]
• 0xFX1E: I = I + V[X]
• 0xFX29: I + location_of_sprite_for_digit_V[X]
• 0xFX33: Store BCD representation of V[X] in memory locations I, I+1 and I+2
• 0xFX55: Store registers V[0x0] through V[X] in memory starting at location I
• 0xFX65: Read registers V[0x0] through V[X] from memory starting at location I

Roms

Tests

• CHIP-8 splash screen
• IBM logo
• Corax+ opcode test
• Flags test
• Quirks test (display refresh rate should be slower)
• Keypad test
• Beep test

Games

T.B.A.

Side Quests

• Add debug mode
• Add telemetry
• Translate C++ code into WebAssembly
• Host assembly code on server

Materials

• Timendus/chip8-test-suite
• CHIP-8 Specification
• CHIP-8 Wikipedia Page
• CHIP-8 Emulator Guide in C++
• CHIP-8 Emulator Guide