Asus P/I-AP55T - Manual (Page 55)

Software Guide
The next line is the "PCI Latency Hmer" setting. Do not change
the "80 PCI Clock" setting. This default setting enables maximum PCI
performance for this mainboard.
Plug And Play
The seven "IRQ ... Used By ISA" lines indicate whether or not
the IRQ indicated for each line is being used by a 'legacy' (non-PnP)
ISA card. The default setting "No/ICU" indicates either that the IRQ
is not in use by the ISA Bus or that an ISA Configuration Utility (ICU)
is being used to determine if an ISA card is using that IRQ. If you
instaU a legacy ISA card that needs a specific IRQ, and you are not
using an ICU, you must set the line for that IRQ to "Yes".
For example, if you install a PnP ISA card that needs to use IRQ
3, you would set the "IRQ 3 Used By ISA" line to "No/ICU". If, how­
ever, you install a legacy ISA card that needs to use IRQ 3, and you
are not using an ICU, set the "IRQ 3 Used By ISA" line to "Yes".
The three "DMA ... Used By ISA" lines indicate whether or not
the DMA charmel listed is being used by a legacy ISA card. The de­
fault setting "No/ICU" indicates either that the DMA channel is not
in use by the ISA Bus or that an ICU is being used to determine if an
ISA card is using that IRQ. If you install a legacy ISA card that needs
to use a specific DMA channel, and you are not using an ICU, you
must set the line for that channel to "Yes".
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