BIOS POST Checkpoints E-3Table E-1 POST Checkpoint List (Continued)Checkpoint Description
7Ch Reset pointing device
Check pointing device
70h Parallel port testing
74h Serial port testing
78h Math Coprocessor testing
80h Set security status
84h KB device initialization
Set KB led upon setup requests
Note: If keyboard Number Lock is enabled, the NumLock LED (if present) should be
turned on.
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
Change POST mode to default text mode
93h Rehook int1c for quiet boot
94h Initialize expansion ROM
Shadow I/O ROM if setup requests
Build up free expansion ROM table
A4h Initialize security feature
A8h Setup SMI parameters
A0h Initialize Timer counter for DOS use
AAh m1523 modify
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