6 security functions – Compaq 4000N User Manual

Page 155

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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

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