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Technical Reference Guide
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
8-7
8.4.1 SYSTEM ID
The INT 15, AX=E800h BIOS function can be used by software to identify the system. The
system ID will be returned in the BX register as follows:
Series System ID
Deskpro 4000N 03D8h
Deskpro 4000S 038Ch
8.4.2 SYSTEM INFORMATION TABLE
The System Information Table (SIT) is a comprehensive list of fixed configuration information
arranged into records. The INT 15 AX=E807h BIOS function accesses the SIT by returning a
pointer in ES:BX to indicate the location of the SIT. This section lists the default values that
should be read from the SIT. For specific bit descriptions and more detailed information on the
SIT refer to the Compaq Basic Input/Output System (BIOS) Technical Reference Guide.
Power Conservation Record, SIT Record 01h
Byte Function
Default
Value
00h Record ID 01h
01h No. of Data Bytes in Record 0Bh
02h Volume, CPU Speed, Screensave, PWR Consv. Mode 07h
03h LED Blink, Popup, APM, PC Level, MAXBRIGHT Control C4h
04h SW Power Cntrl., Screensave/Hard Drive Timeouts, PWR 10h
05h Magic Packet Flag, SMI, Modem Installed [1]
06h-0Bh Popup Location [2]
0Ch Qick Energy Save, Magic Packet PWR, Suspend, CPU Sp. 1Ch
NOTES:
[1] Will be determined at runtime
[2] Unsupported function - read all 0s.
Timeout Counter Record (System Standby), SIT Record 02h
Byte Function
Default
Value
00h Record ID for System Standby Timeout 02h
01h No. of Data Bytes in Record 08h
02h First Value 0
03h 15
04h 20
05h 30
06h 40
07h 45
08h 60
09h Last Value 75