Casio fx-3650P

Casio fx-3650P

Type	Scientific calculator
Manufacturer	Casio
Introduced	2002
Calculator
Entry mode	D.A.L.
Precision	±1 at the 10th d.p.
Display type	2 line display 1st line-dot matrix 2nd line-LCD
Programming
Programming language(s)	Keystroke
Other
Power consumption	Solar cell and G13 Type (LR44) button battery two way power[1]

Casio fx-3650P II

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".^[2][3]

Modes[]

The calculator is available in 6 modes:^[4]

• Basic arithmetic calculations
• Complex number calculations
• Standard deviation calculations
• Regression calculations
• Base-n calculations
• Programs

Basic arithmetic calculations[]

• Arithmetic calculations^[5]
• Fraction operations^[6]
  • Fraction calculations^[6]
  • Decimal↔fraction conversions^[6]
  • Mixed fraction↔improper fraction conversions^[7]
• Percentage calculations^[7]
• Degrees, minutes, seconds calculations^[8]
• Rounding (must be used with Fix decimal display mode)^[8]
• Trigonometric functions^[9]
• Hyperbolic function^[10]
• Logarithm^[10]
• Natural logarithm^[10]
• Antilogarithm^[10]
• Differential calculus^[11]
• Integral calculus^[11]

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.^[12]

• Absolute value and argument calculations^[13]
• Rectangular↔polar form display^[13]
• Conjugate calculations^[14]

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.^[15]

Regression calculations[]

This mode is for statistical calculation and can be divided further into:^[16]

• Linear regression: y=A+Bx^[17]
• Logarithmic regression: y=A+B*ln x^[17]
• Exponential regression: ln y=ln A+Bx^[17]
• Power regression: y=A+x^B[17]
• Inverse regression: y=A+B/x^[18]
• Quadratic regression: y=A+Bx+Cx^2[18]

For some input ordered pairs, one of the below can be calculated.^[19] (The availability differs from modes.^[19])

Σx², Σx, n, Σy², Σy, Σxy, ${\displaystyle {\bar {x}}}$, xσn, xσn-1, ${\displaystyle {\bar {y}}}$, yσn, yσn-1, Regression coefficient A, Regression coefficient B, Correlation coefficient r, ${\displaystyle {\hat {x}}}$, ${\displaystyle {\hat {y}}}$, Σx³, Σx²y, Σx⁴, Regression coefficient C, ${\displaystyle {\hat {x}}}$₁and ${\displaystyle {\hat {x}}}$₂

Program[]

The calculator can hold up to 4 programs with a total capacity of 360 bytes.

Program commands:^[20]

• ? - Operator input command, used when user's input is required. Usually used with →(variable)
• → - Assign to variable command, to assign the value before it to the variable after it. Always used as (value)→(variable).
• : - Multi-statement separator, separate program statements
• ◢ - Output command, output the value
• ${\displaystyle \Rightarrow }$ - Conditional jump, jump when conditions are met
• = - Relational operator
• ≠ - Relational operator
• > - Relational operator
• ${\displaystyle \geqq }$ - Relational operator
• Goto - Unconditional jump, jump to label, otherwise Lbl
• Lbl - Label, jump destination

Conditional jumps[]

Conditional jumps^[21] should be used in the syntax:
condition${\displaystyle \Rightarrow }$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=0${\displaystyle \Rightarrow }$A+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^[20] 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, ${\displaystyle \textstyle \int }$dx, 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.

References[]