Chip-8 Emulator

Keypad:

+---+---+---+---+
| 1 | 2 | 3 | 4 |
+---+---+---+---+
| q | w | e | r |
+---+---+---+---+
| a | s | d | f |
+---+---+---+---+
| z | x | c | v |
+---+---+---+---+