![](/images/new-backgrounds/1241880/24188091x1.webp)
System Support
4.4.2 Standard CMOS Locations
Table
Table
Configuration Memory (CMOS) Map
Location | Function | Location | Function |
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 | Checksum of locations | |
18h | Extended memory, high byte/KB | 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 | ||
1Fh | Power management functions | Feature Control/Status |
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).
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.
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.
| www.hp.com | Technical Reference Guide |