IBM 5280 User's Setup Procedures page 96

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One display screen that you will see and use often is the program load screen.
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. . This display line is called a status line. When it blinks, it is indicating to
you that the system checkout procedure has found a machine failure, or
it is indicating that you have done something wrong. An error code
number is displayed in the blinking status line. The error code number is
enclosed within asterisks or dashes. For example, the error code number
shown in the status line of the illustration above is *3151 *.
You will find a description of every error code number in the IBM 5280
Message Manual that came with your system. The error code description
in the Message Manual will describe the machine failure or will indicate
what you may have done wrong to cause the error. When the error code
description indicates a machine failure, record the error code number for
your service representative.
While the status line is blinking, you are unable to use any of the
alphabetic keys or the numeric keys. Pressing the Reset or Error Reset
key makes the error code disappear, stops the status line blinking, and
makes the keyboard usable. You will have to correct the problem that
caused the blinking error code or call your service representative if the
error code indicates a machine failure.
II
This is the display line where you will be instructed to key TKBD, TDSK,
TPRNT, or TCOM. Keying these names will indicate which part of the
system checkout procedure is to be started.
II
This is the display line where you will be instructed to key a four-digit
number. The number identifies a diskette drive. The diskette drive
numbers are 4000, 4400, 4800, 4COO, 5000, 5400, 5800, or 5COO.
Notice that 4COO and 5COO have the letter C in them that will require you
to press and hold the Alpha key on some keyboards.
a
You will not be instructed to key anything on the Partition number line
during the system checkout procedure.
II
Each display screen has a four-digit number in the lower-right corner.
This four-digit number can help you identify and compare the display
screens to the illustrations in this section.