HP -28S Quick Reference
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HP-28S
Direct-Key Commands
General The following section gives a description of useful commands that are
directly accessible from the keyboard.
• Commands are listed in the order as they show up on the calculator
keyboard, from top left ("A") to bottom right ("+").
• On the calculator menus are generally indicated by a white label
backround.
• In the following text menus are indicated by bold-faced print in the left
column.
• References to other sections of this Quick Reference are also printed
bold-faced.
• When a menu key is pressed it displays six "soft labels" on the bottom
of the LCD screen which are associated with the white top row keys
below the display. Pressing one of these keys will activate the
command written on the soft label.
• Pressing "<>" to the right of the red SHIFT key will remove the soft
labels from the LCD display and the white keys beneath will resume
their cursor-control meanings printed in white above the buttons.
See CURSOR Menu.
Command
line
editin
g
Pressing a command key performs different actions depending on the
current input mode:
• If no command line is currently being edited and Alpha Mode (see
below) is not active the command is immediately applied to the stack
contents.
• If command line editing is in progress some commands will evaluate
the entire command line and produce immediate results. These
commands (ie. STO) perform an implicit ENTER.
• If Alpha-Mode is active or if a command is typed in explicitly or if a
command key is pressed which doesn't perform an implicit ENTER (ie.
"+") then the command word or symbol is appended to the command
line.
To abort editing without executing any commands press ON.
ARRAY Vector and matrix creation, manipulation and operations.
See ARRAY Menu.
BINARY Binary number bases (bin, dec, oct, hex) and operations including rotation.
See BINARY Menu.
COMPLX Complex number creation and operations. See COMPLX Menu.
STRING String functions and conversions. See STRING Menu.
LIST List creation and manipulation. See LIST Menu.
e
When 'e' (lower case E) is converted into a number using →NUM it
evaluates to 2.71828…
If flag 35 is clear then 'e' immediately evaluates to its numeric value.
See Flags and Evaluation Rules.
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