TYAN Titan Turbo S1573S ATX-2 Manual page 47

Primary IDE INT# and Secondary IDE INT#
Up to four interrupts (INT# A, INT# B, INT# C, and INT# D) can be
activated by each PCI peripheral connection. A PCI connection is
assigned INT# A by default. Unless the peripheral device requires two
interrupt services, assigning INT# B will have no effect. Note that the
PCI IDE interface in the chipset has two channels, and therefore
requires two interrupt services. The default values for the Primary and
Secondary IDE INT# fields are appropriate for two PCI IDE channels.
The Secondary channel has a higher interrupt than the Primary.
Used Mem base addr
This function designates a base address for the memory area used by
peripheral devices that require high memory.
Used Mem Length
Selects a length for the high memory area specified in the previous
field. If no base address is specified, this field will not appear.
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