M src/gb/io.c → src/gb/io.c

@@ -107,6 +107,7 @@ case 0x20:
 		break;
 	default:
 		// ???
+		keys = 0;
 		break;
 	}
 	return 0xC0 | (gb->memory.io[REG_JOYP] | 0xF) ^ (keys & 0xF);