Printronix L5520 - Manual (Page 59)

Active Emulation (If Installed)
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When you turn on the printer, it reads the flash memory as part of
its initialization to determine what emulations are installed. Based
on this information, the printer then creates the appropriate
selections on the Mode menu. During power-up, the printer also
loads the power-up set of configuration values. The power-up set is
the same as the factory set until you save a new set to power-up.
NOTE: Each emulation can have its own set of configuration
options in addition to those that are in the printer system
list. For information on these unique configuration settings,
see the appropriate emulation manual.