HP Color LaserJet 5500 Technical Reference Manual page 250

Printer Status
Readback
Commands That
Affect Printer Memory
A-38 Feature Support
Variables Not Stored in NVRAM
COPIES
FORMLINES
MEDIASOURCE
MEDIATYPE
ORIENTATION
Printers that support printer status readback:
HP DeskJet 1600C, 1600M
Because the DeskJet 1600C and 1600CM do not support
USTATUS or INFO, only the requested status information
will come back from the printer.
Printers affected by memory reconfiguration:
HP DeskJet 1600C, 1600M
Three conditions may cause the printer to reconfigure user
memory:
When the printer language changes, either explicitly by
using the ENTER command, or implicitly.
When the page protection setting changes, either using
the SET, DEFAULT, or RESET commands.
When the resolution is changed using either the SET or
DEFAULT commands.
Reconfiguring printer memory may erase all volatile
personality-specific resource information, including
downloaded fonts, PCL macros, and PostScript dictionaries
(however no I/O data is lost). Memory can be reconfigured
only when these conditions actually change the page
PAGEPROTECT
PAPER
PRINTQUALITY
RENDERMODE
RESOLUTION