Common Options : NA, 4, 1, 2, 3

Details

The PCI bus is much faster than the ISA bus. So, for ISA cards to work properly with I/O cycles from the PCI bus, the I/O bus recovery mechanism adds additional bus clock cycles between each consecutive PCI-originated I/O cycles to the ISA bus.

By default, the bus recovery mechanism adds a minimum of 3.5 clock cycles between each consecutive 16-bit I/O cycle to the ISA bus. The options above enable you to add even more clock cycles between each consecutive 16-bit I/O cycle to the ISA bus. Choosing NA sets the number of delay cycles at the minimum 3.5 clock cycles.

So, set the 16-bit I/O Recovery Time at NA if possible for optimal ISA bus performance. Increase the I/O Recovery Time only if you are having problems with your 16-bit ISA cards. Note that this function has no meaning if you are not using any ISA cards.