Calculator Documentation


The display is partioned into three areas.

  1. result area
  2. status area
  3. information area

The result area contains the lastest result or the values the user has entered.

The status area shows the current mode of operation.

The information area displays information about the currently selected key.

Modes of Operation

The calculator can be operating in the following modes:

  • scientific mode num con
  • logic mode num con
  • constant mode num con
  • user function edit mode (selected by menu)
To change to the needed mode the respective keys must be selected.


The following table shows the assigned functionalities to the keys of the cell phone.

0, 1, 2, ..., 9append the respective digit to the calculator
#calculate the entered term (like =)
*append a decimal point to the calculator (like .)
navigation upmove the cursor for the key up
navigation downmove the cursor for the key down
navigation leftmove the cursor for the key left
navigation rightmove the cursor for the key right
navigation pressedsimulate the key press of the selected key
menu buttonshow the menu


Desired TermKeys
1 + 2 1 + 2 =
sin(3) 3 sin =
3! 3 ! =
4*(2+3) 4 * ( 2 + 3 ) = (Note: the closing bracket is optional)

Engineering Display

Any result can be changed from a scientic notation to the engineering notation by using the ENG key.

Storing to Memory

The lastest result of a calculation is always stored to the ANS storage. It can be retrieved by just pressing the ANS key.

In addition to this there are 6 more memories. The currently displayed value can be stored into one of them by pressing STO. After that the display should change to STO. The value is then stored by pressing one of the storage keys SA, SB, ... SF.

Restoring from Memory

The value of the memory can be transfered to the display by pressing RCL. After that the display should change to RCL. The value is then recalled by pressing one of the storage keys rA, rB, ... rF.

Define User Functions

function keys

The highlighted keys of the following pictures show which keys can hold user spefic functions. The keys f1 and f2 change to f3 and f4 when the shift key is selected providing to additional function keys.

By selecting "Edit Functions" from the menu the user function keys can be changed. After that a new form opens with the following entries:

KeyAt this position the respective key can be selected as shown in the picture above.
NameThis is the name that appears inside of the key of the calculator
FunctionAt this point the function can be entered. To ease the entry the "Operators" and "Variables" selectors can be used. The function must be entered in the form like it would be done on the calculator directly.
Please note that it is mandatory to have spaces between the operators and the variables/numbers
DescriptionThe description appears in the information area everytime the key is selected. It can be used for information about the function e.g. what memories must be stored prior to the use or just to describe the function.

Examples for user defined functions:

Function TermFunction must be entered asUsage
1/x1 / x5 f1
x! / (y! * (x - y)!)x ! / ( y ! * ( x - y ) ! )4 9 f1 6
sin(x) + 1x sin + 15 f1

Known Limitations

  • trigonometric functions support only radian

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