Compaq dc7800 Technical Reference Guide: HP Compaq dc7800 Series Business Desk - Page 48
System Management - reset bios
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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. Location 00-0Dh 0Eh 0Fh 10h 11h 12h 13h 14h 15h 16h 17h 18h 19h 1Ah 1Bh 1Ch 1Dh 1Eh 1Fh Table 4-6. Configuration Memory (CMOS) Map Function Location Function Real-time clock 24h System board ID Diagnostic status 25h System architecture data System reset code 26h Auxiliary peripheral configuration Diskette drive type 27h Speed control external drive Reserved 28h Expanded/base mem. size, IRQ12 Hard drive type 29h Miscellaneous configuration Security functions 2Ah Hard drive timeout Equipment installed 2Bh System inactivity timeout Base memory size, low byte/KB 2Ch Monitor timeout, Num Lock Cntrl Base memory size, high byte/KB 2Dh Additional flags Extended memory, low byte/KB 2Eh-2Fh Checksum of locations 10h-2Dh Extended memory, high byte/KB 30h-31h Total extended memory tested Hard drive 1, primary controller 32h Century Hard drive 2, primary controller 33h Miscellaneous flags set by BIOS Hard drive 1, secondary controller 34h International language Hard drive 2, secondary controller 35h APM status flags Enhanced hard drive support 36h ECC POST test single bit Reserved 37h-3Fh Power-on password Power management functions 40-FFh 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. 4-10 www.hp.com Technical Reference Guide