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4-10 Troubleshooting
CP Reason
44 Initialize BIOS interrupts
45 POST device initialization
46 Check ROM copyright notice
47 Initialize manager for PCI Option ROMs
48 Check video configuration against CMOS
49 Initialize PCI bus and devices
4A Initialize all video adapters in system
4B Display QuietBoot screen
4C Shadow video BIOS ROM
4E Display copyright notice
4F Allocate memory for the multiboot data
50 Display Processor type and speed
52 Test keyboard
54 Set key click if enabled
55 USB initialization
56 Enable keyboard
58 Test for unexpected interrupts
59 Initialize the POST display service
5A Display prompt “Press F2 to enter SETUP”
5B Disable L1 cache during POST
5C Test RAM between 512 and 640k
60 Test extended memory
62 Test extended memory address lines
64 Jump to UserPatch1
66 Configure advanced cache registers
67 Quick init of all AP's early in post
68 Enable external and processor caches
69 Initialize the SMM handler
6A Display external cache size
6B Load custom defaults if required
6C Display shadow message
6E Display non-disposable segments
70 Display error messages
72 Check for configuration errors
74 Test real-time clock
76 Check for keyboard errors
7A Test for key lock on
7C Set up hardware interrupt vectors
7D Intelligent system monitoring
7E Test coprocessor if present
81 POST device initialization routine
82 Detect and install external RS232 ports
83 Configure non-MCD IDE controllers
84 Initialize parallel ports
85 Initialize PC-compatible PnP ISA devices
86 Re-initialize on board I/O ports
87 Configure Mother Board Configurable Devices
88 Initialize BIOS Data Area
89 Enable Non-Maskable Interrupts