HP 50g Graphing Calculator - Manual (Page 843)

Page H-1
Appendix H
The CAS help facility
The CAS help facility is available through the keystroke sequence I
L
@HELP `. The following screen shots show the first menu page in the
listing of the CAS help facility.
The commands are listed in alphabetical order. Using the vertical arrow keys
—˜ one can navigate through the help facility list. Some useful hints on
navigating through this facility are shown next:
Θ You can hold down the down arrow key ˜ and watch the screen until
the command you’re looking for shows up in the screen. At this point,
you can release the down arrow key. Most likely the command of
interest will not be selected at this point (you may overshoot or
undershoot it). However, you can use the vertical keys —˜, one
stroke at a time, to locate the command you want, and then press
@@OK@@.
Θ If, while holding down the down arrow key ˜ you overshoot the
command of interest, you can hold down the up arrow key — to
move back towards that command. Refine the selection with the
vertical keys —˜, one stroke at a time.
Θ You can type the first letter of the command of interest, and then use the
down arrow key ˜ to locate that particular command. For example,
if you’re looking for the command DERIV. After activating the help
facility (I L
@HELP `), type ~d. This will select the first of
the commands that start with D, i.e., DEGREE. To find DERIV, press
˜
, twice. To activate the command, press @@OK@@.