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Chapter 2 WINBIOS Setup 55
PCI/PnP Setup
Choose the PCI/PnP Setup icon from the WINBIOS Setup screen to display
the PCI and Plug and Play Setup options, described below.
Plug and Play-Aware OS Set this option to Yes if the operating system in this computer is
aware of and follows the Plug and Play specification. Windows 95 is PnP-
aware. The settings are Yes or No. The Optimal and Fail-Safe default settings
are No.
PCI VGA Palette Snoop When this option is set to Enabled, multiple VGA devices operating
on different buses can handle data from the CPU on each set of palette
registers on every video device. Bit 5 of the command register in the PCI
device configuration space is the VGA Palette Snoop bit (0 is disabled). For
example: if there are two VGA devices in the computer (one PCI and one
ISA) and the VGA Palette Snoop bit is:
Snoop Bit Action
Disabled
Data read and written by the CPU is only directed to the PCI VGA device's
palette registers.
Enabled
Data read and written by the CPU is directed to the both the PCI VGA device
palette registers and the ISA VGA device palette registers, and the palette
registers of both devices can be identical.
This option must be set to Enabled if an ISA adapter card installed in the
system uses VGA palette snooping. The Optimal and Fail-Safe default
settings are Disabled.
Allocate IRQ to PCI VGA Set this option to Yes to allocate an IRQ to a VGA adapter card
that uses the PCI local bus. The settings are Yes or No. The Optimal and Fail-
Safe default settings are Yes.
PCI Slot-1 Latency Timer
PCI Slot-2 Latency Timer
PCI Slot-3 Latency Timer
PCI Slot-4 Latency Timer These options specify the latency timings (in PCI clocks) for PCI
devices installed in the four PCI expansion slots. The settings are 32, 64, 96,
128, 160, 192, 224, or 248. The Optimal and Fail-Safe default settings are 64.
USB Device Latency Timer This option specifies the latency timings (in PCI clocks) for USB
devices installed in the computer. The settings are 32, 64, 96, 128, 160, 192,
224, or 248. The Optimal and Fail-Safe default settings are 64.
USB Device IRQ Preference These options specify the IRQ priority for USB devices installed
in the computer. The settings are Auto, IRQ5, IRQ9, IRQ10, IRQ11, IRQ14,
and IRQ15, in priority order. If Auto is selected, AMIBIOS automatically
determines the optimal IRQ priority order. The Optimal and Fail-Safe default
settings are Auto.
PCI Slot-1 IRQ Preference
PCI Slot-2 IRQ Preference
PCI Slot-3 IRQ Preference
PCI Slot-4 IRQ Preference These options specify the IRQ priority for PCI devices installed in
the four PCI expansion slots. The settings are Auto, IRQ5, IRQ9, IRQ10,
IRQ11, IRQ 14, and IRQ15, in priority order. If Auto is selected, AMIBIOS
automatically determines the optimal IRQ priority order. The Optimal and
Fail-Safe default settings are Auto.
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