Compaq 4000S Personal Computer User Manual


 
Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
8-15
8.4.6 SECURITY FUNCTIONS
The INT 15 AX=E829h BIOS function is used to control various security features of the system.
This function may be issued remotely (over a network) by a driver. A request buffer must be built
(by the driver) for each security feature prior to making the call. This system supports the
following security features:
QuickLock
QuickBlank
Diskette drive boot disable
Diskette drive write disable
IDE controller disable
Serial ports disable
Parallel port disable
Change administrator password
Hood removal sensor
Ownership tag
Asset tag
USB disable
The write-protect function that determines diskette write control is extended to cover all drives
that use removable read/write media (i.e., if diskette write protect is invoked, then any diskette
drive, power drive (SCSI and/or ATAPI), and floptical drive installed will be inaccessible for
(protected from) writes). Client management software should check the following bytes of SIT
record 07h for the location and access method for this bit:
System Information Table, Peripheral and Input Device Record (07h) (partial listing)
Byte Bit Function
1Fh 7-0 Removable Read/Write Media Write Protect Enable Byte Offset (0-255)
20h
7..4
3..0
Removable Read/Write Media Write Protect Enable Bit Location:
CMOS Type:
0000 = CMOS
0001 = High CMOS
0010 = NVRAM
0011 = Flat model NVRAM
Bit Location:
0000 = Bit 0 0100 = Bit 4
0001 = Bit 1 0101 = Bit 5
0010 = Bit 2 0110 = Bit 6
0011 = Bit 3 0111 = Bit 7