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BIOS POST Checkpoints E-3
Table 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