Edid Retrieve; Drive Fault Prediction - Compaq Deskpro EP 6233 Technical Reference Manual

Chapter 7 BIOS ROM
7.4.3

EDID RETRIEVE

The BIOS function INT 15, AX=E813h is a tri-modal call that retrieves the VESA extended
display identification data (EDID). Two subfunctions are provided: AX=E813h BH=00h retrieves
the EDID information while AX=E813h BX=01h determines the level of DDC support.
Input:
AX
BH
BH
If BH = 00 then
DS:(E)SI = Pointer to a buffer (128 bytes) where ROM will return block
If 32-bit protected mode then
DS:(E)SI = Pointer to $DDC location
Output:
(Successful)
If BH
CX
CF
AH
If BH
BH
BL
(Failure)
CF
AH
7.4.4

DRIVE FAULT PREDICTION

The Compaq BIOS provides direct Drive Fault Prediction support for IDE-type hard drives. This
feature is provided through two 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-Intellisafe Hard Drive detects imminent failure"
7-12 Compaq Deskpro EP Series of Personal Computers
= E813h
= 00 Get EDID .
= 01 Get DDC support level
= 0:
DS:SI=Buffer with EDID file.
= Number of bytes written
= 0
=00h Completion of command
= 1:
= System DDC support
<0>=1 DDC1 support
<1>=1 DDC2 support
= Monitor DDC support
<0>=1 DDC1 support
<1>=1 DDC2 support
<2>=1 Screen blanked during transfer
= 1
= 86h or 87h
First Edition - April 1998