I-Tech Company WBX-6200F-V - Manual (Page 35)

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Host cycles that hit the aperture range are forwarded to the
AGP without any translation, usually set as 64MB.
USB Controller
This option will enable / disable on-chip USB function
USB Device Legacy Support
This feature will be automatically disabled and hidden if user
chooses the “Disabled” setting from the foregoing USB
Function option. Otherwise, enabling this option provides
support for USB-keyboard without auxiliary driver under DOS
environment.
Spread Spectrum
This option is for EMI test only.
HDD UDMA Mode Control
This Options specifies HDD UltraDMA mode.
Options are: Normal, Force Mode2.
WDT Timer Control
This option specifies the length of the period of the watchdog
timer (WDT).