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System Startup, Configuration, and Shutdown Reference Manual (32650-90907)

ManualsBrandsHP ManualsSoftwareMPE/iX 7.0 Operating System
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Chapter 2
Initiating System Activity
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2 Initiating System Activity
Separate firmware routines of processor-dependent code (PDC) and input/output-dependent code (IODC)
perform the system self-test and initialization after resetting HP Precision Architecture hardware.
The initial program load (IPL), the first software retrieved from the boot device, implements the
operating-system-independent portion of the bootstrap process. The initial system loader (ISL), a boot-device-
based IPL utility, provides the user interface for displaying or modifying system startup functions.