Acer extensa 390 Service Manual
BIOS POST Checkpoints
E-3
Table E-1
POST Checkpoint List
Checkpoint
Description
80h
•
Set security status
84h
•
KB device initialization
•
Enable KB device
6Ch
•
FDD testing & parameter table setup
Note: The FDD LED should flash once and its head should be positioned
88h
•
HDD testing & parameter table setup
89h
•
Get CPU MUX
Note: This routine is to identify the user-set CPU frequency, not CPU-required frequency
90h
•
Display POST status if necessary
93h
•
Rehook int1c for quiet boot
94h
•
Initialize I/O ROM
A4h
•
Initialize security feature
A8h
•
Setup SMI parameters
A0h
•
Initialize Timer counter for DOS use
ACh
•
Enable NMI
•
Enable parity checking
•
Set video mode
B0h
•
Power-on password checking
•
Display configuration table
•
Clear memory buffer used for POST
•
Select boot device