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IBM Personal Computer User Guide
USB Setup
Use the settings for in this menu item to enable or disable the Universal Serial Bus
(USB) functions.
USB Controller
Select enabled if you will be using USB devices.
USB Keyboard Support
Select enabled to use a USB keyboard. The USB Controller must also be set to
enabled. Select disabled to use a keyboard that connects to the standard keyboard
connector.
IDE drives setup
PIO (Programmed Input/Output)
Each IDE drive controller can support up to two separate drives. IDE drives have a
master/slave relationship which are determined by the cabling configuration used to
attach them to the controller. Your system supports two IDE controllers, a primary
and a secondary, so you have the ability to install up to four separate IDE drives.
PIO means Programmed Input/Output. Rather than have the BIOS issue a series of
commands to control a transfer to or from the disk drive, PIO allows the BIOS to tell
the controller what it wants and then lets the controller and the processor perform
the complete task by themselves. PIO provides increased efficiency.
Your system supports five modes, numbered from 0 to 4, which primarily differ in
timing. When Auto (default) is selected, the BIOS selects the best available mode
for the following four setup items:
• IDE Primary Master PIO
• IDE Primary Slave PIO
• IDE Secondary Master PIO
• IDE Secondary Slave PIO
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