Temperature Status; Drive Fault Prediction; Pnp Support; Table 8-5. Pnp Bios Functions - Compaq Deskpro Workstation AP230 Technical Reference Manual

8.5.3 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.

8.5.4 DRIVE FAULT PREDICTION

The Compaq BIOS directly supports Drive Fault Prediction for IDE-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"
8.6

PNP SUPPORT

The BIOS includes Plug 'n Play (PnP) support for PnP version 1.0A. Table 8-5 lists the PnP
functions supported.

Table 8-5. PnP BIOS Functions

Function Register
00h Get number of system device nodes
01h Get system device node
02h Set system device node
03h Get event
04h Send message
50h Get SMBIOS Structure Information
51h Get Specific SMBIOS Structure
The BIOS call INT 15, AX=E841h, BH=01h can be used by an application to retrieve the default
settings of PnP devices for the user. The application should use the following steps for the display
function:
1. Call PnP function 01(get System Device Node) for each devnode with bit 1 of the control flag
set (get static configuration) and save the results.
2. Call INT 15, AX=E841h, BH=01h.
3. Call PnP "Get Static Configuration" for each devnode and display the defaults.
4. If the user chooses to save the configuration, no further action is required. The system board
devices will be configured at the next boot. If the user wants to abandon the changes, then the
application must call PnP function 02 (Set System Device Node) for each devnode (with bit 1
of the control flag set for static configuration) with the results from the calls made prior to
invoking this function.
Table 8-5.
PnP BIOS Functions
Third Edition - April 2001
Technical Reference Guide
Compaq Deskpro Personal Computers 8-15