B-5
Appendix B: BIOS POST Checkpoint Codes
Checkpoint
Code Description
54h
Shutdown was successful. The CPU is in real mode. Disabling the Gate A20 line, parity, and
the NMI next.
57h
The A20 address line, parity, and the NMI are disabled. Adjusting the memory size depending
on relocation and shadowing next.
58h
The memory size was adjusted for relocation and shadowing. Clearing the Hit <DEL> message
next.
59h
The Hit <DEL> message is cleared. The <WAIT...> message is displayed. Starting the DMA
and interrupt controller test next.
60h
The DMA page register test passed. Performing the DMA Controller 1 base register test next.
62h
The DMA controller 1 base register test passed. Performing the DMA controller 2 base register
test next.
65h
The DMA controller 2 base register test passed. Programming DMA controllers 1 and 2 next.
66h
Completed programming DMA controllers 1 and 2. Initializing the 8259 interrupt controller next.
67h
Completed 8259 interrupt controller initialization.
7Fh
Extended NMI source enabling is in progress.
80h
The keyboard test has started. Clearing the output buffer and checking for stuck keys. Issuing
the keyboard reset command next.
81h
A keyboard reset error or stuck key was found. Issuing the keyboard controller interface test
command next.
82h
The keyboard controller interface test completed. Writing the command byte and initializing the
circular buffer next.
83h
The command byte was written and global data initialization has completed. Checking for a
locked key next.
84h
Locked key checking is over. Checking for a memory size mismatch with CMOS RAM data
next.
85h
The memory size check is done. Displaying a soft error and checking for a password or
bypassing WINBIOS Setup next.
86h
The password was checked. Performing any required programming before WINBIOS Setup
next.
87h
The programming before WINBIOS Setup has completed. Uncompressing the WINBIOS Setup
code and executing the AMIBIOS Setup or WINBIOS Setup utility next.
88h
Returned from WINBIOS Setup and cleared the screen. Performing any necessary program-
ming after WINBIOS Setup next.
89h
The programming after WINBIOS Setup has completed. Displaying the power on screen mes-
sage next.
8Ch
Programming the WINBIOS Setup options next.
8Dh
The WINBIOS Setup options are programmed. Resetting the hard disk controller next.
8Fh
The hard disk controller has been reset. Confi guring the fl oppy drive controller next.
91h
The fl oppy drive controller has been confi gured. Confi guring the hard disk drive controller next.
95h
Initializing the bus option ROMs from C800 next. See the last page of this chapter for additional
information.
96h
Initializing before passing control to the adaptor ROM at C800.
97h
Initialization before the C800 adaptor ROM gains control has completed. The adaptor ROM
check is next.
98h
The adaptor ROM had control and has now returned control to BIOS POST. Performing any
required processing after the option ROM returned control.
