Specifications

2.3.2 Peripheral Hardware Tests
The first peripheral hardware test procedure verifies that the system
configuration data stored in CMOS RAM matches the hardware present.
Then, the procedures continue to test and initialize other peripheral hardware.
This testing includes memory on the system board and, if one is installed, the
memory module. A test failure generally results in an error message on the
monitor screen. The following list of the peripheral hardware tests shows the
order of execution:
ISA CMOS RAM and EISA nonvolatile (FLASH) memory configuration
data
Serial/parallel interface circuitry
Video
Keyboard
RAM memory above 64 KB
Coprocessor
Diskette drive controller
Hard disk controller
Option ROMs, such as SCSI and LAN
Intel 486 CPU internal cache memory
2.3.3 POST Sequence
While POST is running, a numeric countdown (800 to 000) is displayed on the
monitor.
Note
During the POST memory test, the amount of memory being tested is
displayed on the screen. Depending on the amount of extended memory
installed, the POST memory test can take several minutes to complete.
POST does not check memory after a soft boot.
The POST message displayed may take one of two forms, depending on
whether POST detected any configuration errors. Examples follow.
System Troubleshooting 2–3