Compaq AlphaServer GS80 User Manual page 161

Halt In and Continue
The halt in command halts the operating system. The continue command
releases the halt.
Issuing the continue command will restart the operating system even if the
Halt button is latched in.
Reset
NOTE: The environment variable, auto_quit, must be enabled for the reset
command to return to the console or operating system.
The SCM reset command restarts the system. The console device exits SCM
and reconnects to the server's COM1 port.
SCM_E0> reset
Returning to COM port
Using the System Control Manager 8-23