System Id; System Information Table - Compaq Deskpro 4000N Technical Reference Manual

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:
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
00h Record ID
01h No. of Data Bytes in Record
02h Volume, CPU Speed, Screensave, PWR Consv. Mode
03h LED Blink, Popup, APM, PC Level, MAXBRIGHT Control
04h SW Power Cntrl., Screensave/Hard Drive Timeouts, PWR
05h Magic Packet Flag, SMI, Modem Installed
06h-0Bh Popup Location
0Ch Qick Energy Save, Magic Packet PWR, Suspend, CPU Sp.
NOTES:
[1] Will be determined at runtime
[2] Unsupported function - read all 0s.
Timeout Counter Record (System Standby), SIT Record 02h
Byte Function
00h Record ID for System Standby Timeout
01h No. of Data Bytes in Record
02h First Value
03h
04h
05h
06h
07h
08h
09h Last Value
Series
Deskpro 4000N
Deskpro 4000S
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September 1997
Technical Reference Guide
System ID
03D8h
038Ch
Default
Value
01h
0Bh
07h
C4h
10h
[1]
[2]
1Ch
Default
Value
02h
08h
0
15
20
30
40
45
60
75
8-7