Motorola ML910 - Manual (Page 106)

5-12 BIOS Setup Utility & MLUA
Please enter "BIOS Setup Utility" menu and perform the following setup procedure:
1. Click “Advanced “.
2. Select “Peripherals Configuration”.
3. To disable "Serial Port 1".
("Serial Port 1" is located on the left side of the notebook. When you disable it,
this
Serial Port1 will not be functional.)