IBM MICRO TOWER 2169 Hardware Maintenance Manual page 53

Integrated Peripherals Option
This option displays a list of items that defines the operation of
some peripheral components on the system's input/output
ports.
IDE device driver controllers can support up to two separate
drives. These drives have a master/slave relationship which is
determined by the cabling configuration used to attach them to
the controller.
PIO means Programmed Input/Output. Rather than have the
BIOS issue a series of commands to effect a transfer to or from
the disk drive, PIO allows the BIOS to tell the controller what it
wants and then let the controller and the CPU perform the
complete task by themselves. This is simpler and more efficient.
Your system suports five modes, numbered from 0 to 4, which
primarily differ in timing. When Auto(default) is selected, the
BIOS will select the best available mode.
On-Chip Primary PCI IDE
On-Chip Secondary PCI IDE
Use these items to enable or disable the PCI IDE channels that
are integrated on this System Board.
IDE Primary Master PIO
IDE Primary Slave PIO
IDE Secondary Master PIO
IDE Secondary Slave PIO
Each IDE channel supports a master device and a slave device.
These four items let you assign which kind of PIO (Programmed
Input/Output) is used by IDE devices. You can choose Auto, to
let the system auto detect which PIO mode is best, or you can
install a PIO mode from 0-4.
IDE Primary Master UDMA
IDE Primary Slave UDMA
IDE Secondary Master UDMA
IDE Secondary Slave UDMA
Each IDE channel supports a master device and a slave device.
This motherboard supports UltraDMA. UltraDMA technology
provides faster access to IDE devices. If you install a device
which supports UltraDMA, change the appropriate item on this
list to Auto.
USB Controller
Use this item to enable the USB ports that are integrated on this
System Board.
USB Keyboard Support
Default: Enabled
Default: Enabled
Default: Auto
Default: Auto
Default: Auto
Default: Auto
Default: Auto
Default: Auto
Default: Auto
Default: Auto
Default: Enabled
Default: Disabled
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