IBM RS/6000 44P 270 Service Manual page 210

Software Default: This option, if supported by the operating system,
enables you to select a default operating system for your system unit.
Install From: Enables you to select a media drive from which to install an
operating system. Selection of a device is done using the spacebar.
Boot Sequence: Enables you to view and change the custom boot list (the
sequence in which devices are searched for operating system code). You
may choose from 1 to 5 devices for the custom boot list.
The default boot sequence is:
1. Diskette
2. The CD-ROM drive
3. Tape drive
4. Hard disk drive
5. Network adapter
To change the custom boot list, enter a new order in the New column, then
click on the Save icon. The list of boot devices is updated to reflect the
new order.
Attention: To change the custom boot list back to the default values, click
on Default. If you change your startup sequence, you must be extremely
careful when performing write operations (for example, copying, saving, or
formatting). You can accidentally overwrite data or programs if you select
the wrong drive.
OK Prompt: Enables you to go directly to the open firmware command
prompt. The open firmware command prompt is used for debugging and
device driver development. For more information about the operation of the
ok>
open firmware command prompt, refer to IEEE Standard 1275.
The open firmware command line can also be used to set up adapters
that are not configurable with the System Management Services. Your
adapter documentation directs you to use this option if it is needed. Do not
invoke this feature if you are not familiar with open firmware. To exit from
the command prompt, restart your system.
Multiboot Startup: Clicking on this button toggles whether the Multiboot
menu displays automatically at startup.
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Service Guide