Intel AN430TX - Motherboard - ATX Technical Product Specification page 75

Table 44. Port 80h Codes (continued)
Code Description of POST Operation Currently In Progress
70h Display error messages
72h Check for configuration errors
74h Test real-time clock
76h Check for keyboard errors
7Ah Test for key lock on
7Ch Set up hardware interrupt vectors
7Eh Initialize coprocessor if present
80h Disable onboard Super I/O ports and IRQs
81h Late POST device initialization
82h Detect and install external RS232 ports
83h Configure non-MCD IDE controllers
84h Detect and install external parallel ports
85h Initialize PC-compatible PnP ISA devices
86h Re-initialize onboard I/O ports
87h Configure Motherboard Configurable Devices
88h Initialize BIOS Data Area
89h Enable Non-Maskable Interrupts (NMIs)
8Ah Initialize Extended BIOS Data Area
8Bh Test and initialize PS/2 mouse
8Ch Initialize floppy controller
8Fh Determine number of ATA drives
90h Initialize hard-disk controllers
91h Initialize local-bus hard-disk controllers
92h Jump to UserPatch2
93h Build MPTABLE for multi-processor boards
94h Disable A20 address line (Rel. 5.1 and earlier)
95h Install CD-ROM for boot
96h Clear huge ES segment register
97h Fixup Multi Processor table
98h Search for option ROMs. One long, two short beeps on checksum failure
99h Check for SMART Drive
9Ah Shadow option ROMs
9Ch Set up Power Management
9Eh Enable hardware interrupts
9Fh Determine number of ATA and SCSI drives
A0h Set time of day
A2h Check key lock
A4h Initialize typematic rate
Error Messages
continued
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