Library Numbers; Deleting A Library; Creating Libraries; Backup Battery - HP 48gII User Manual

Library numbers

If you use the LIB menu (‚á) and press the soft menu key corresponding
to port 0, you will see library numbers listed in the soft menu key labels. Each
library has a four-digit number associated with it. These numbers are
assigned by the library creator, and are used for deleting a library.

Deleting a library

To delete a library from a port, use:
•
In algebraic mode:
•
In RPN mode:
Where lib_number is the library number described above.

Creating libraries

A library can be written in Assembler language, in System RPL language, or
by using a matrix-creating library such as LBMKR. The latter program is
available online (see for example, http://www.hpcalc.org). The details of
programming the calculator in Assembler language or in System RPL language
are beyond the scope of this document. The user is invited to find additional
information on the subject online.

Backup battery

A CR2032 back up battery is included in the calculator to provide power
backup to volatile memory when changing the main batteries. It is
recommended that you replace this battery every 5 years. A screen message
will indicate when this battery needs replacement. The diagram below shows
the location of the backup battery in the top compartment at the back of the
calculator.
PURGE(:port_number: lib_number)
: port_number : lib_number PURGE
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