BIOS POST Check Point List 4-37
BIO
S
Se
tu
p
4B
The amount of memory above 1MB has been found and
verified. Checking for a soft reset and clearing the memory
below 1MB for the soft reset. If this is a power on situation,
checkpoint 4Eh is next.
4C
The memory below 1MB has been cleared via a soft reset.
Clearing the memory above 1MB.
4D
The memory above 1MB has been cleared via soft reset.
Saving the memory size. Going to checkpoint 52h next.
4E
The memory test started, but not as the result of a soft reset.
Displaying the first 64kB memory size.
4F
Memory size display started. This will be updated during the
memory test. Performing the sequential and random memory
test.
50
Memory testing/initialization below 1MB completed.
Adjusting the displayed memory size for relocation and
shadowing.
51
The memory size display was adjusted for relocation and
shadowing. Testing the memory above 1MB.
52
The memory above 1MB has been tested and initialized.
Saving the memory size information.
53
The memory size information and the CPU registers are
saved. Entering real mode.
54
Shutdown was successful. The CPU is in real mode. Disabling
the Gate A20 line, parity, and the NMI.
57
The A20 address line, parity, and the NMI are disabled.
Adjusting the memory size depending on relocation and
shadowing.
58
The memory size was adjusted for relocation and shadowing.
Clearing the “
Hit [DEL]
” message.
Code
Description
(Continued)
