Acer 500L - Manual (Page 53)

Chapter 3 BIOS Utility 3-7
Serial Port 1
This parameter shows the serial port 1 address and IRQ setting.
Serial Port 2
This parameter shows the serial port 2 address and IRQ setting.
Parallel Port
This parameter shows the parallel port address and IRQ setting.
PS/2 Mouse
The BIOS utility automatically detects if there is a pointing device
connected to your system. If there is, this parameter displays the
Installed setting. Otherwise, it is set to None.