Filter
Top Products
Chapter 8 BIOS ROM
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
8-6
8.4.1 SYSTEM ID
The INT 15, AX=E800h BIOS function can be used to identify the system board. This function
will return the system ID in the BX register.
System Board CMOS ID ROM Type System ID
007998 or 008123 7Eh 686T3 0400h
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 90h
05h Magic Packet Flag, SMI, Modem Installed [1]
06h-0Bh Popup Location [2]
0Ch Quick Engy. Save, Magic Packet PWR, Suspend, CPU Sp. 39h
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 09h
02h First Value 0
03h 10
04h 15
05h 20
06h 30
07h 60
08h 120
09h 180
0Ah Last Value 240