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.
