Nowadays USB is the generally accepted standard for connection of various internal devices to the system block. Modern computers may have six, eight or more USB-connectors and they may be located on the front, back or side panel of the computer.

USB Controller (OnChip USB Controller, OnChip EHCI Controller)

This parameter switches on (a value Enabled (On)) or off (a value Disabled (Off)) the built-in USB-controller. As USB-devices are rather popular nowadays, there are no serious reasons to select the second value.

USB 2.0 Controller (USB 2.0 Support)

This parameter allows listing a version of the protocol (USB 1.1 or USB 2.0) which USB-controller will operate with.

Possible values:

  • Enabled (On) – USB 2.0 protocol is used which provides much higher speed of data transmission;
  • Disabled (Off) – USB 1.1 protocol is used. This value may be selected only if there are some problems in functioning of devices with USB 2.0 protocol.

USB Legacy Support (USB Keyboard Support Via)

This parameter enables or disables BIOS support of USB-devices and is important in case of USB-keyboard usage.

Possible values:

  • Enabled (On, BIOS) – the support of USB-devices at the level of BIOS is allowed. This value must be set only if a computer uses USB-keyboard or the other devices necessary for Windows booting;
  • Disabled (Off, OS) – BIOS support of USB-devices is off. This value is recommended to be set if USB-devices are used only after Windows booting.

USB-Mouse Support

This parameter switches on the support of USB-mouse at a level of BIOS and it is similar to the previous parameter “USB Keyboard Support Via”. It must be switched on if USB-mouse is necessary in such operating systems as MS-DOS.