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Chapter 4 System Support
4.5.1 CLEARING CMOS
NOTE: There is no provision for clearing the contents of CMOS in iPAQ 1.0/1.2
systems. Recovery from a suspected corrupted CMOS is by using the Power Button
Override function as described in section 4.5.2.
The contents of configuration memory (including the Power-On Password) can be cleared on
iPAQ 2.0 systems using the following procedure:
1.
Turn off the unit.
2.
Disconnect the AC power cord from the outlet and/or system unit.
3.
Remove the chassis hood (cover).
4.
Insert a non-metallic object (such as a pencil eraser) through the CMOS clear button access
hole and press and release the CMOS clear button.
5.
Replace the chassis hood (cover).
6.
Reconnect the AC power cord to the outlet and/or system unit.
7.
Turn the unit on.
To clear only the Power-On Password refer to section 4.6.1.1.
4.5.2 CMOS ARCHIVE AND RESTORE
On iPAQ 1.0/1.2 systems, the BIOS saves a copy of NVRAM (CMOS contents, password(s) and
other system variables) in a portion of the flash ROM during the boot sequence. Should the system
become un-usable, the last good copy of NVRAM data can be restored with the Power Button
Override function. This function is invoked with the following procedure:
1.
With the unit powered down, press and release the power button.
2.
Immediately after releasing the power button in step 1, press and hold the power button until
the unit powers down. This action will be recorded as a Power Button Override event.
With the next startup sequence the BIOS will detect the occurrence of the Power Button Override
event and will load the backup copy of NVRAM from the ROM to the CMOS.
NOTE: The Power Button Override feature does not allow quick cycling of the system
(turning on then off). If the power cord is disconnected during the POST routine, the
splash screen image may become corrupted, requiring a re-flashing of the ROM (refer to
chapter 8, BIOS ROM).
4-12
Compaq iPAQ Series of Desktop Personal Computers
Second Edition – February 2001
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