Dell Precision 420 - Manual (Page 122)

select Reset, and then choose Enabled, Enabled-Silent, or Disabled.
CPU Serial Number
CPU Serial Number determines whether the microprocessor serial number(s) (if any) is provided to programs that request it. When Enabled is
selected, the system provides the microprocessor serial number(s) to programs that request it. When Disabled is selected, the system never
provides the microprocessor serial number(s). The default is Disabled.
System Time
System Time enables the time on the computer's internal clock to be reset.
Time is kept in a 24-hour format (hours:minutes:seconds). To change the time, press the left- or right-arrow key to select a field, and then press
plus (+) or minus (
–) to increase or decrease the number. If you prefer, you can type numbers in each of the fields.
ZIP Floppy Support
ZIP Floppy Support enables or disables the support of Advanced Technology Attachment Packet Interface (ATAPI) ZIP devices by the system
BIOS. When Enabled is selected, ATAPI ZIP devices are supported as diskette drives and the first ZIP device is listed as a bootable device
under
Boot Sequence . When Disabled is selected, the system BIOS ignores ATAPI ZIP devices, though the operating system may still support
them.
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NOTE: When the setup password is enabled, you must know the setup password before you can reset the Chassis Intrusion option.