HP 48G - Memory), Directories and Paths

MEMORY), DIRECTORIES AND PATHS
The machine’s memory is organized into a hierarchi-
cal tree of directories, which you construct. Each
parentdirectory can have one or more subdirectories
belowit. Those subdirectories, inturn, can be parents
to their own subdirectories, etc. Here’s an example:
HOME
DIF1 EIILGE DIR3
DIRH DIRE rMizC
LOERE
To build this example structure, you’d start at the built-
inHOME directory (press (=]HOME)), and use CROIF to
create the other directories (as with most commands
involving names, you enter either a group of namesin
atl list Torone'name' atatime): (q[(a]e)D[1]R)
spcIp] 1 IR)2)sPc]D] 1 JR] 3 JENTER[ ] C]R] B
(ENTER. Those three directories now appear in the
VAR menu of your HOHE directory (press (VAR)). Note
how directory menu items resemble tabbed folders.
Press lEM. This new directory is empty —nothing
stored in it yet. Now create one sub-directory, MIZL:
(aJoJCIRID) 1 [R)(ENTER).
Similarly, createNFif and DIRE inDIR1 : Press(—[HOME),
then M to move to that directory. Then:
(«[D] 1 RJAIsPc)(DL1JR]B]SPC] (e]eJc]RID]1]R)
(ENTER). Now press Rillil and create one subdirectory,
KORK:: (o c[W[O]RIKIENTER @@ C RIDI 1 RIENTER)
The current directory (where puts named ob-
jects) is simply your currentlocation, which you change
by moving about in the tree. (<JUP) moves you up a
level at a time.) Note how the annunciator area dis-
plays the complete path of the current directory (and
the FATH command will produce that path list on the
stack forhandy storage and/or quick navigation later).
A directory structure helps organize your information,
but more importantly, it helps to shield named objects
from accidental “clobbering” during unrelated opera-
tions. When given any name to evaluate (execute),
the HP 48G/GX first looks in the current directory for
that name. If it doesn’t find it there, it looks upward,
one level at a time, along the path (toward HOME). So
any named object stored in a directory in the path of
8 THE HP 48G/GX Pocker GuiDE