BIOS ROM

8.5.1 System ID and ROM Type

Diagnostic applications can use the INT 15, AX=E800h BIOS function to identify the type of system. This function will return the system ID in the BX register. Systems have the following IDs and ROM family types:

Table 8-4

System ID Numbers

 

 

Subsystem

System (Form Factor)

System ID

Device ID

 

 

 

USDT

0A5Ch

2803h

 

 

 

SFF/ST:

0A54h

2801h

 

 

 

MT:

0A50h

2800h

 

 

 

CMT:

0A58h

2802h

NOTE: For all systems, BIOS ROM Family = 786E1, PnP ID = CPQ0968, and Subsystem vendor ID = 103Ch.

The ROM family and version numbers can be verified with the Setup utility or the Compaq Insight Manager or Diagnostics applications.

8.5.2 Temperature Status

The BIOS includes a function (INT15, AX=E816h) to retrieve the status of a system's interior temperature. This function allows an application to check whether the temperature situation is at a Normal, Caution, or Critical condition.

8.5.3 Drive Fault Prediction

The BIOS directly supports Drive Fault Prediction for IDE (ATA)-type hard drives. This feature is provided through two Client Management BIOS calls. Function INT 15, AX=E817h is used to retrieve a 512-byte block of drive attribute data while the INT 15, AX=E81Bh is used to retrieve the drive's warranty threshold data. If data is returned indicating possible failure then the following message is displayed:

1720-SMART Hard Drive detects imminent failure

 

8-16

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