IBM ThinkPad 770, Supplementary Manual

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Enabling the IDE Drive on the Docking Station
If you have installed an IDE device (such as a hard disk drive or a
CD-ROM drive) in the docking station, you must change the setting
on your computer to enable the device. By default, your computer
uses the primary IDE channel for the primary hard disk drive
(Primary-Master) and the secondary IDE channel for a device in the
UltraBay II (Secondary-Master). You cannot use the IDE device in
the docking station in this default 2-channel default IDE mode.
To enable an IDE device in the docking station, you must change the
default setting to either of the following:
3-channel IDE mode
2-channel IDE mode
In 3-channel IDE mode, you can still use the hot and warm plug or
unplug functions. An additional IRQ for the third IDE channel is
required.
In 2-channel IDE mode, you do not have to assign an extra IRQ.
However, you will not be able to use hot and warm plug or unplug
functions.
Note:
If you change the IDE channel configuration, the drive letter
assignment may be changed.
Setting to 3-Channel IDE Mode
1
Open the ThinkPad Configuration program.
2
Click on the Docking Station ( ) button.
3
Change the IRQ value in IRQ Holder for PCI Steering to a
value other than IRQ 11 or 15 (IRQ 9 is recommended).
4
Select Enable IDE devices. Make sure the third IDE channel
is selected in the list box. By default, the third IDE is
automatically selected.
5
Click on OK to close the dialog box.
6
Select OK in the warning dialog box. The system restarts.
7
Title: C79DKMST CreationDate: 08/19/97 17:47:41