HP kp721av Manuale Utente
4-10
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Technical Reference Guide
System Support
4.4.2 Standard CMOS Locations
Table 4-6 describes standard configuration memory locations 0Ah-3Fh. These locations are
accessible through using OUT/IN assembly language instructions using port 70/71h or BIOS
function INT15, AX=E823h.
accessible through using OUT/IN assembly language instructions using port 70/71h or BIOS
function INT15, AX=E823h.
NOTES:
Assume unmarked gaps are reserved.
Higher locations (>3Fh) contain information that should be accessed using the INT15, AX=E845h
BIOS function (refer to Chapter 8 for BIOS function descriptions).
Assume unmarked gaps are reserved.
Higher locations (>3Fh) contain information that should be accessed using the INT15, AX=E845h
BIOS function (refer to Chapter 8 for BIOS function descriptions).
4.5 System Management
This section describes functions having to do with security, power management, temperature,
and overall status. These functions are handled by hardware and firmware (BIOS) and generally
configured through the Setup utility.
and overall status. These functions are handled by hardware and firmware (BIOS) and generally
configured through the Setup utility.
4.5.1 Security Functions
These systems include various features that provide different levels of security. Note that this
subsection describes only the hardware functionality (including that supported by Setup) and
does not describe security features that may be provided by the operating system and application
software.
subsection describes only the hardware functionality (including that supported by Setup) and
does not describe security features that may be provided by the operating system and application
software.
Table 4-6.
Configuration Memory (CMOS) Map
Location Function
Location
Function
00-0Dh
Real-time clock
24h
System board ID
0Eh
Diagnostic status
25h
System architecture data
0Fh
System reset code
26h
Auxiliary peripheral configuration
10h
Diskette drive type
27h
Speed control external drive
11h
Reserved
28h
Expanded/base mem. size, IRQ12
12h
Hard drive type
29h
Miscellaneous configuration
13h
Security functions
2Ah
Hard drive timeout
14h
Equipment installed
2Bh
System inactivity timeout
15h
Base memory size, low byte/KB
2Ch
Monitor timeout, Num Lock Cntrl
16h
Base memory size, high byte/KB
2Dh
Additional flags
17h
Extended memory, low byte/KB
2Eh-2Fh
Checksum of locations 10h-2Dh
18h
Extended memory, high byte/KB
30h-31h
Total extended memory tested
19h
Hard drive 1, primary controller
32h
Century
1Ah
Hard drive 2, primary controller
33h
Miscellaneous flags set by BIOS
1Bh
Hard drive 1, secondary controller
34h
International language
1Ch
Hard drive 2, secondary controller 35h
APM status flags
1Dh
Enhanced hard drive support
36h
ECC POST test single bit
1Eh
Reserved
37h-3Fh
Power-on password
1Fh
Power management functions
40-FFh
Feature Control/Status