HP 9000 300 Series Hardware Configuration Manual page 41

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The number-letter designation for the operating system you will select is
1H.
Enter that prefix by typing
1H (Return).
That operating system will boot.
If you do not enter this information, the boot ROM will designate the first
system it scans as the "Selected System".
If you previously set the
system selected will be
your controller.
option to "yes," the operating
each time you turn on
This completes the selection process, and the system will now proceed with
booting the selected system for this and future sessions.
Configuring Internal Interfaces and Boot Modes 3-11
3