Abit SI-1NS User Manual page 31

BIOS Setup 3-9
Delayed Transaction
When set to [Enabled], the PCI bus will be freed up when the CPU is accessing 8-bit
ISA cards. This will allow PCI and ISA buses to be used more efficiently and
prevents performance dropping on the PCI bus. This process normally consumes
about 50-60 PCI clocks without PCI delayed transaction. Leave this item to its default
[Disabled] setting when using ISA cards that are not PCI 2.1 compliant.
CPU Clock Ratio
This item selects the multiplier factors for your CPU if it is not locked.
User's Manual