POST checkpoint codes
65
60h Performs memory tests on extended RAM.
62h Preforms address tests on extended RAM.
66h Configures MTRR for extended memory caching.
67h Initializes the non-primary processors.
68h Enables cache(s).
69h Initializes SMM, SMRAM and SMI code.
6Ah Displays cache size.
6Ch Displays BIOS shadow status.
6Eh Zeroes un-initialized extended memory with cache on.
70h Displays any errors found.
72h Checks bad configuration.
76h Reports if there was a Keyboard or Controller failures.
7Ch Initializes hardware interrupt vectors.
7Eh Coprocessor initialization.
81h POST device initialization.
82h Initializes RS232 devices.
83h Configures non-MCD IDE controllers.
84h Initializes parallel port(s).
85h Configures PC Compatible Plug and Play ISA devices.
87h Initializes MCDs (motherboard configurable devices).
88h Initializes time-outs, key buffer, soft reset flag, and shadow RAM.
89h Enables NMIs.
8Ah Initializes extended BIOS data area.
8Bh Sets up PS/2 mouse interrupt & initialize extended BDA.
8Ch Initializes legacy floppy disk drive(s).
90h Tests hard disks.
91h Programs timing registers according to PIO modes.
93h Creates MP tables.
95h Tests CDROM.
96h Exits big real mode.
97h Fixes up the MP table physical pointer and checksum.
98h Configures non-PC-compatible Plug and Play ISA devices, PCI IRQs, enable PCI devices and
ROM-scan.
99h Checks SMART status.
9Ch Late SMM (system memory mode) initialization.
9Dh Initializes the system security engine.
9Eh Enables the proper hardware interrupts.
A0h Sets time of day.
A2h Tests if key lock or keyboard controller password is on.
A8h Removes the “Press F2 for Setup“prompt.
Checkpoint Code Description
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