Acer Altos 500 Altos 500 Service Guide - Page 75

IDE Controller Set this parameter to Primary to enable only the primary IDE controller; Both to enable both primary and secondary IDE controllers; or Disabled to disable all IDE controllers. PS/2 Mouse Controller This parameter enables or disables the onboard PS/2 mouse controller. USB Host Controller This parameter lets you enable or disable the USB controller on board. When enabled, it activates the USB function of the system. When disabled, it deactivates the function. USB Legacy Mode This function, when enabled, lets you use a USB keyboard in DOS. Set this to Disabled to deactivate the USB keyboard function in DOS. SMBus Interrupt (IRQ9) The System Management Bus (SMBus) is used for controlling and getting information from devices on a motherboard. It was designed for hybrid devices based on analog semiconductor technologies and with limited digital capabilities. This parameter allows you to enable or disable this feature. Onboard Ethernet Chip This parameter allows you to enable or disable the onboard network feature. BIOS Utility 3-19