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3.5 Power-On Self-Test (POST)
The power-on self-test (POST) is a series of system tests that verify the
correct operation of the base system and most options.
time the system is powered-on.
information it detects with the configuration stored in the CMOS RAM.
test takes up to 90 seconds to finish, depending on the options installed.
The POST can detect critical and noncritical errors in the following
areas:
System board
Memory
Processor adapter
Keyboard
Diskette drives
Fixed disk drives
Serial port
Parallel port.
Some adapters have read-only memory (ROM) modules that contain extended
BIOS routines that work with the system POST.
To start the POST, power-on the system.
The keyboard status lights blink on, then off.
While the memory is being tested, the memory size appears in the top
left corner of the screen in 64KB increments.
When the POST is successful, one short beep occurs.
If an operating system is not automatically loaded from a fixed disk
drive and a diskette is not present in drive A, the diskette prompt is
displayed along with the F1 prompt.
icons showing that a diskette should be inserted into diskette drive
A.
Press the F1 key to continue loading programs from the diskette.
If POST errors occur, they are displayed on the screen for a few seconds
and then disappear, while the POST attempts to continue.
error, the POST may or may not continue.
Note:
To hold the POST errors on the screen, press the Pause key while
the errors are being displayed.
When a POST error is detected, the system displays the POST error message
along with a message generated from the fixed disk drive.
message instructs the user to take a specific action to solve the problem.
The message is not intended for use by trained service personnel.
IBM HMR Diagnostics for Micro Channel
Power-On Self-Test (POST)
It compares the system configuration
The following happens:
The diskette and F1 prompts are
PICTURE 3
Press the F1 key to continue.
¦ Copyright IBM Corp. 1990
3.5 - 1
The POST runs each
The
Depending on the
This additional
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