Casio fx-3650P

Casio fx-3650P is a programmable scientific calculator manufactured by Casio Computer Co., Ltd. It can store 12 digits for the mantissa and 2 digits for the exponent together with the expression each time when the "EXE" button is pressed. Also, the calculator can use the previous result to do calculations by pressing "Ans".
Modes.
The calculator is available in 6 modes:
Complex number calculations.
In this mode, if the result has both real and imaginary parts, an "R↔I" symbol will appear at the top right corner.
Standard deviation calculations.
This mode is for statistical calculation. For some input data, the sum of squares of values (Σx2), sum of values (Σx), number of data (n), sample standard deviation (xσn-1) and population standard deviation (xσn) can be calculated.
Regression calculations.
This mode is for statistical calculation and can be divided further into:
For some input ordered pairs, one of the below can be calculated. (The availability differs from modes.)
Σx2, Σx, n, Σy2, Σy, Σxy, formula_1, xσn, xσn-1, formula_2, yσn, yσn-1, Regression coefficient A, Regression coefficient B, Correlation coefficient r, formula_3, formula_4, Σx3, Σx2y, Σx4, Regression coefficient C, formula_31and formula_32
Program.
The calculator can hold up to 4 programs with a total capacity of 360 bytes.
Program commands:
Conditional jumps.
Conditional jumps should be used in the syntax:
"condition"formula_7"statement 1":"statement 2"
When "condition" is true, statement 1 is executed, then statement 2 is executed. If "condition" is false, statement 1 is skipped and statement 2 is executed.
E.g.:
...A=0formula_7A+1→B:C+5→D:...
If A=0, both A+1→B and C+5→D is executed. If A≠0, only C+5→D is executed.
Unconditional jumps.
Unconditional jumps use Goto and Lbl to operate.
When Goto "n" (where n is an integer in 0-9) is executed, the program will jump to Lbl "n". Loops can be created with unconditional jumps.
System check.
The calculator will perform a system check when shift, 7 and ON are pressed together. The system check has 3 parts.
Part 1: Elements check - All display elements are turned on when the system check is initiated. Pressing [SHIFT] turns the elements off. Press [SHIFT] to proceed. The next 2 screens have similar functions.
Part 2: display check - The dot matrix screen will display "24      PRG13" and the LCD screen will display "0000000000 00". Press shift to proceed. Then the display becomes "BBBBBBBBBB" and "1111111111 11". Then "CCCCCCCCCC" and "222222222 22" and so on up till "JJJJJJJJJJ""9999999999 99". Press shift to proceed to part 3.
Part 3: key check - Press shift, the LCD will display 1. Press alpha, up, down, left, right in order. The display will increase by 1 each time you press a button. Next, press MODE, prog, formula_11dx, x−1, x3, and so on up till Ans. When EXE is pressed, the display becomes "24      OK""13" (The display differs from version, the above is for version 4 of the calculator which is the latest version). Press ON to end the system check.