Filter
Top Products
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
programming after WINBIOS Setup next.
89h The programming after WINBIOS Setup has completed. Displaying the power on screen
message 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.