Compaq AlphaServer DS20E Reference Manual page 231

7.23.7 os_type
The os_type environment variable specifies the default operating
system. This variable is set at the factory to the setting for the
operating system you purchased. Use this command to change the
factory default setting.
The value of os_type takes effect only after you reset the system by pressing
the Reset button or by issuing the init command.
The syntax is:
set os_type os_type
The options for os_type are:
Sets the default to Tru64 UNIX. The SRM firmware is started
unix
during power-up or reset.
Sets the default to OpenVMS. The SRM firmware is started
vms
during power-up or reset.
Example
In this example, the default operating system is set to Tru64 UNIX. After the
system is initialized, the Tru64 UNIX banner is displayed.
P00>>> set os_type unix
P00>>> init
.
.
.
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Using the SRM Console 7-63