Chapter 7 BIOS ROM
Compaq Deskpro EP Series of Personal Computers
First Edition - April 1998
7-6
7.4.1 SYSTEM ID/REVISION/SERIAL NO.
The INT 15, AX=E800h BIOS function can be used to identify the system board. The system ID
will be returned in the BX register as follows:
System System Board # ROM Type System ID
66-MHz slot 1 (2-DIMM socket) 008312-xxx 686T1 046Ch
100-MHz slot 1 (3-DIMM socket) 009635-xxx 686T2 041Ch
The INT 15, AX=E814h BIOS function retrieves the system board revision. The serial number
can be read by software through function INT 15, AX=E819h.
7.4.2 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 Qick Energy Save, Magic Packet PWR, Suspend, CPU Sp. 1Dh
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
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