IBM H Series Installation And Service Manual page 366

Displays the boot progress indicators (checkpoints), up to a maximum of 100,
from the system boot prior to the one in progress. This historical information can
help to diagnose system faults.
The progress indicators are displayed in two sections. Above the dashed line
are the progress indicators (latest) from the boot that produced the current ses-
sions. Below the dashed line are progress indicators (oldest) from the boot pro-
ceeding the one that produced the current sessions.
The progress indicator codes are listed top (latest) to bottom (oldest). If the <===
arrow occurs, use the 4-digit checkpoint or 8-character error code being pointed
to as the beginning point for your service actions.
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RS/6000 Enterprise Server Model H Series Installation and Service Guide