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MegaRUM PCI Motherboard User’s Guide60
Chipset Setup, Continued
ISA 16 Bit I/O Recovery This option specifies the length of the delay that is added to the CPU
cycle between consecutive 16-bit I/O operations. The length of the delay is
related to the CPU type and frequency. The settings are 1 Sysclock, 2
Sysclocks, 3 Sysclocks, 4 Sysclocks, or Disabled. The Optimal and Fail-Safe
default settings are Disabled.
Memory Hole This option specifies the location of an area of memory that cannot be
addressed on the ISA bus. The settings are Disabled, 15 MB-16 MB, or
512KB-640KB. The Optimal and Fail-Safe default settings are Disabled.
Deturbo Frequency (MHz) This option specifies the deturbo frequency (in megahertz). The
deturbo frequency is a low speed used only for old software that cannot
operate at high speed. The settings are 6 MHz, 8 MHz, 12 MHz, or Disabled.
The Optimal and Fail-Safe default settings are Disabled.
USB Function Set this option to Enabled to enable the system BIOS USB (Universal Serial
Bus) functions. The settings are Enabled or Disabled. The Optimal and Fail-
Safe default settings are Disabled.
USB Keyboard/Mouse Legacy Support Set this option to Enabled to enable USB support for
legacy keyboards and mice. The settings are Enabled or Disabled. The Optimal
and Fail-Safe default settings are Disabled.