Known "out-of-spec" implementation

• CHIP-8 has it's own VRAM and does not use 4kb or RAM

CHIP-8 instructions implementation progress

• 0nnn - SYS addr: Jump to a machine code routine at nnn
• 00E0 - CLS: Clear the display
• 00EE - RET: Return from a subroutine
• 1nnn - JP addr: Jump to location nnn
• 2nnn - CALL addr: Call subroutine at nnn
• 3xkk - SE Vx, byte: Skip next instruction if Vx = kk
• 4xkk - SNE Vx, byte: Skip next instruction if Vx != kk
• 5xy0 - SE Vx, Vy: Skip next instruction if Vx = Vy
• 6xkk - LD Vx, byte: Set Vx = kk
• 7xkk - ADD Vx, byte: Set Vx = Vx + kk
• 8xy0 - LD Vx, Vy: Set Vx = Vy
• 8xy1 - OR Vx, Vy: Set Vx = Vx OR Vy
• 8xy2 - AND Vx, Vy: Set Vx = Vx AND Vy
• 8xy3 - XOR Vx, Vy: Set Vx = Vx XOR Vy
• 8xy4 - ADD Vx, Vy: Set Vx = Vx + Vy, set VF = carry
• 8xy5 - SUB Vx, Vy: Set Vx = Vx - Vy, set VF = NOT borrow
• 8xy6 - SHR Vx {, Vy}: Set Vx = Vx SHR 1
• 8xy7 - SUBN Vx, Vy: Set Vx = Vy - Vx, set VF = NOT borrow
• 8xyE - SHL Vx {, Vy}: Set Vx = Vx SHL 1
• 9xy0 - SNE Vx, Vy: Skip next instruction if Vx != Vy
• Annn - LD I, addr: Set I = nnn
• Bnnn - JP V0, addr: Jump to location nnn + V0
• Cxkk - RND Vx, byte: Set Vx = random byte AND kk
• Dxyn - DRW Vx, Vy, nibble: Display n-byte sprite
• Ex9E - SKP Vx: Skip next instruction if key with the value of Vx is pressed
• ExA1 - SKNP Vx: Skip next instruction if key with the value of Vx is not pressed
• Fx07 - LD Vx, DT: Set Vx = delay timer value
• Fx0A - LD Vx, K: Wait for a key press, store the value of the key in Vx
• Fx15 - LD DT, Vx: Set delay timer = Vx
• Fx18 - LD ST, Vx: Set sound timer = Vx
• Fx1E - ADD I, Vx: Set I = I + Vx
• Fx29 - LD F, Vx: Set I = location of sprite for digit Vx
• Fx33 - LD B, Vx: Store BCD representation of Vx in memory locations I, I+1, and I+2
• Fx55 - LD [I], Vx: Store registers V0 through Vx in memory starting at location I
• Fx65 - LD Vx, [I]: Read registers V0 through Vx from memory starting at location I