Opcodes

Instruction		Opcode	OK
CLS	CLEAR	00E0	[X]
RET	Return	00EE	[ ]
JP addr	JUMP addr	1NNN	[X]
CALL addr	CALL	2NNN	[ ]
SE Vx, byte	Vx == byte	3XNN	[X]
SNE Vx, byte	Vx != byte	4XNN	[X]
SE Vx, Vy	Vx == Vy	5XY0	[X]
LD Vx, byte	Vx = byte	6XNN	[X]
ADD Vx, byte	Vx += byte	7XNN	[X]
LD Vx, Vy	Vx = Vy	8XY0	[X]
OR Vx, Vy	Vx OR Vy	8XY1	[X]
AND Vx, Vy	Vx &= Vy	8XY2	[X]
XOR Vx, Vy	Vx ^= Vy	8XY3	[X]
ADD Vx, Vy	Vx += Vy	8XY4	[X]
SUB Vx, Vy	Vx -= Vy	8XY5	[X]
SHR Vx {, Vy}	Vx >>= 1	8XY6	[X]
SUBN Vx, Vy	Vx = Vy - Vx	8XY7	[X]
SHL Vx {, Vy}	Vx <<= 1	8XYE	[X]
SNE Vx, Vy	Vx != Vy	9XY0	[X]
LD I, addr	I = addr	ANNN	[X]
JP V0, addr	Jump offset	BNNN	[ ]
RND Vx, byte		CXNN	[ ]
DRW Vx, Vy, nibble	DRAW	DXYN	[X]
SKP Vx	Is a key not pressed?	EX9E	[ ]
SKNP Vx	Is a key pressed?	EXA1	[ ]
LD Vx, DT	delay → Vx	FX07	[X]
LD Vx, K	wait for a keypress	FX0A	[X]
LD DT, Vx	Vx → delay	FX15	[X]
LD ST, Vx	Vx → sound tmr	FX18	[X]
ADD I, Vx	I += Vx	FX1E	[X]
LD F, Vx	sprite addr→I	FX29	[X]
LD B, Vx	BCD → mem	FX33	[X]
LD [I], Vx	regs → mem	FX55	[X]
LD Vx, [I]	mem → regs	FX65	[X]

DRAW

Hex is converted to binary and the 1's is a ON pixels, and 0's is OFF pixels

Hex	Binary	Pixels
F0	11110000	####....
90	10010000	#..#....
90	10010000	#..#....
90	10010000	#..#....
F0	11110000	####....

Keypad

╔═══╦═══╦═══╦═══╗ ║ 1 ║ 2 ║ 3 ║ C ║ ╠═══╬═══╬═══╬═══╣ ║ 4 ║ 5 ║ 6 ║ D ║ ╠═══╬═══╬═══╬═══╣ ║ 7 ║ 8 ║ 9 ║ E ║ ╠═══╬═══╬═══╬═══╣ ║ A ║ 0 ║ B ║ F ║ ╚═══╩═══╩═══╩═══╝

╔═══╦═══╦═══╦═══╗ ║ 1 ║ 2 ║ 3 ║ 4 ║ ╠═══╬═══╬═══╬═══╣ ║ q ║ w ║ e ║ r ║ ╠═══╬═══╬═══╬═══╣ ║ a ║ s ║ d ║ f ║ ╠═══╬═══╬═══╬═══╣ ║ z ║ x ║ c ║ v ║ ╚═══╩═══╩═══╩═══╝

References

• https://github.com/mattmikolay/chip-8/wiki/Mastering-CHIP%E2%80%908
• https://github.com/stianeklund/chip8