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7.2 About Power-On Self-Test (POST)
Diagnostics
The POST diagnostic code resides in flash PROM on the main logic board. The flash
PROM that holds the POST code is known as the OpenBoot PROM (OBP) because it
also holds the OpenBoot Diagnostic code.
POST tests the following system components each time the system is turned on or a
system reset is issued:
CPU modules
Diagnostics and Troubleshooting 187