DEC 4000 AXP Service Manual page 200

Table A–1 (Cont.) Environment Variables
# Variable
System-Dependent Environment Variables
pal
screen_mode
sys_serial_num
tt_allow_login
tta_merge
Key to variable attributes:
NV - Nonvolatile. The last value saved by system software or set by console commands is preserved
across system initializations, cold bootstraps, and long power outages.
W - Warm nonvolatile. The last value set by system software is preserved across warm bootstraps
and restarts.
RO - Read-only. The variable cannot be modified by system software or console commands.
A–18 Environment Variables
Attributes Function
RO Specifies the versions of OpenVMS and OSF/1
PALcode in the firmware. For instance, OpenVMS
PALcode X5.12B, OSF/1 PALcode X1.09A.
NV Specifies whether or not the power-up screens or
console event log are displayed during power-up.
ON (default; FIS process sets to ON)—
Displays the two power-up screens during
power-up.
OFF—Displays the console event log during
power-up.
NV FIS process writes a system serial number to this
variable.
NV Turned off at manufacturing during console
loopback testing.
1 (default)—Normal console setting
0—Allows console loopback tests to run
Ties the console serial port and auxiliary serial
port together, so that a customer can monitor
remote services.
0 (default)—Console and auxiliary serial ports
operate independently.
1—Input entered through the auxiliary port,
and output to the auxiliary port, is mirrored
on the console port.
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