HP (Hewlett-Packard) 50g ユーザーズマニュアル

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Double integrals are also possible.  For example,
which evaluates to 36.   Partial evaluation is possible, for example:
This integral evaluates to 36.
Organizing data in the calculator
You can organize data in your calculator by storing variables in a directory 
tree.  To understand the calculator’s memory, we first take a look at the file 
directory.   Press the keystroke combination „¡ (first key in second row of 
keys from the top of the keyboard) to get the calculator’s File Manager screen:
This screen gives a snapshot of the calculator’s memory and of the directory 
tree.  The screen shows that the calculator has three memory ports (or memory 
partitions), port 0:IRAMport 1:ERAM, and port 2:FLASH .  Memory ports are 
used to store third party application or libraries, as well as for backups.    The 
size of the three different ports is also indicated.  The fourth and subsequent 
lines in this screen show the calculator’s directory tree.  The top directory 
(currently highlighted) is the Home directory, and it has predefined into it a sub-
directory called CASDIR.  The File Manager screen has three functions 
associated with the soft-menu keys: 
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