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Technical Reference Guide
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
4-55
4.8.6 SMART COVER LOCK
The chassis cover (also known as the “hood”) can be locked to prevent unauthorized personnel
from removing the cover and changing the system hardware. The locking mechanism consists of
a solenoid controlled by the Setup utility through the Client Management logic in a Compaq
ASIC. The presence of the Smart Cover Lock (actually of the solenoid) is detected by logic and
readable by software at 87307 GPIO port 1 bit <6>.
The cover lock mechanism can be bypassed in an emergency by removing three screws on the
rear of the chassis with the Smart Cover Lock Failsafe Key.
4.8.7 SMART COVER REMOVAL SENSOR
This system includes a cover removal indication function. The system can, upon power-up,
notify the user if the computer cover has been removed. The sensor consists of a plunger switch
mounted on the backplane (riser card) that comes in contact with the chassis cover. When the
cover is removed, the switch is activated and the battery-backed logic places a high at 87307
GPIO port 1 bit <4>. This bit will remain set (whether or not the cover is replaced) until the
system is powered up and the user completes the boot sequence successfully, at which time the
hood alarm bit <5> will be cleared. Through Setup, the user can set this function to one of three
levels of support for a “hood removed” condition:
Level 0 - Hood removal indication is essentially disabled at this level. During POST, Bit <4> is
cleared and no other action is taken by BIOS.
Level 1 - During POST the message “The computer’s cover has been removed since the last
system start up” is displayed and time stamps in CMOS and SIT are updated.
Level 2 - During POST the “The computer’s cover has been removed since the last system start
up” message is displayed, time stamps in CMOS and SIT are updated, and user is prompted for
administrator password.
NOTE:
If the user invokes Setup through F10 the administrator password is not
requested again.