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Chapter 7 BIOS ROM
7.5 CLIENT MANAGEMENT FUNCTIONS
Table 7-4 lists the client management BIOS functions supported by the systems covered in this
guide. These functions, designed to support intelligent manageability applications, are Compaq-
specific unless otherwise indicated.
Table 7-4. Client Management Functions (INT15)
Table 7-4.
Client Management Functions (INT15)
AX Function Mode
E800h Get system ID Real, 16-, & 32-bit Prot.
E813h Get monitor data Real, 16-, & 32-bit Prot.
E814h Get system revision Real, 16-, & 32-bit Prot.
E816h Get temperature status Real, 16-, & 32-bit Prot.
E817h Get drive attribute Real
E818h Get drive off-line test Real
E819h Get chassis serial number Real, 16-, & 32-bit Prot.
E820h [1] Get system memory map Real
E81Ah Write chassis serial number Real
E81Bh Get hard drive threshold Real
E81Eh Get hard drive ID Real
E827h DIMM EEPROM Access Real, 16-, & 32-bit Prot.
NOTE:
[1] Industry standard function.
All 32-bit protected-mode functions are accessed by using the industry-standard BIOS32 Service
Directory. Using the service directory involves three steps:
1. Locating the service directory.
2. Using the service directory to obtain the entry point for the client management functions.
3. Calling the client management service to perform the desired function.
The BIOS32 Service Directory is a 16-byte block that begins on a 16-byte boundary between the
physical address range of 0E0000h-0FFFFFh. The format is as follows:
Offset
No. Bytes Description
00h 4 Service identifier (four ASCII characters)
04h 4 Entry point for the BIOS32 Service Directory
08h 1 Revision level
09h 1 Length of data structure (no. of 16-byte units)
0Ah 1 Checksum (should add up to 00h)
0Bh 5 Reserved (all 0s)
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
7-12