Problem related to key pressing

[HiNett]

Problem encountered:

• When we press a key for too long, the program unexpectedly changes the sprite.
• When we press a key other than the expected "4Bh", "4Dh", "48", "50", the program displays no sprite, and Pac-Man stops.

The program should have :

• Not display different sprites when the arrow keys are held down.
• The program should not perform any actions on keys other than those indicated.

[HiNett]

Fixed : Commit 76fd317