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+# Using Numworks' modules `kandinsky`, `ion` and `time` with PythonExtra
+
+PythonExtra offers the possibility of using certain Numworks modules in order to make the scripts of this machine compatible as is on Casio fx-CG50 (no support on the fx9860G due to insufficient memory and lack of color screen ).
+
+This is a Work in Progress (WIP) and the support is subject to extensive testing at this stage. The port concerns the Numworks `kandinsky`, `ion` and `time` modules which are machine specific and are now supported via this implementation. The `math`, `cmath`, `random` modules being identical between the `Numworks` version and the `builtins` modules of MicroPython, they are therefore not part of this implementation but are perfectly usable without modification in the scripts.
+
+Note: the `turtle` and `matplotlib.pyplot` modules are not included in this implementation. It is possible to use the `turtle`, `matplotlib` and `casioplot` modules from Casio Education which are perfectly functional and provided as an example in `ports/sh/examples`.
+
+
+## `kandinsky`
+
+The `kandinsky` module provides support for graphics primitives via high-performance `gint` routines. All the functions of this module are available:
+
+- `color(r,g,b)`: Generates the value of the color r,g,b. You can also simply use a tuple to define a color: (r,g,b).
+
+- `get_pixel(x,y)`: Returns the color of the pixel at x,y coordinates as a tuple (r,g,b).
+
+- `set_pixel(x,y,color)`: Lights the pixel x,y of the color color.
+
+- `draw_string(text,x,y,[color1],[color2])`: Displays the text at x,y coordinates. The arguments color1 (text color) and color2 (text background color) are optional.
+
+- `fill_rect(x,y,width,height,color)`: Fills a rectangle of width width and height height with the color color at the point of x and y coordinates.
+
+The module also offers a certain number of colors explicitly named and accessible by a character string. The following values ​​can be used instead of the color parameters of the `kandinsky` functions:
+- "red", "r"
+- "green", "g"
+- "blue", "b"
+- "black", "k"
+- "white", "w"
+- "yellow", "y"
+- "pink"
+- "magenta"
+- "grey", "gray"
+- "purple"
+- "orange"
+- "cyan"
+- "brown"
+
+The following functions are additions to take advantage of the wide screen of the fxCG and are therefore an extension of the `Kandinsky` module. They are therefore by definition not compatible with Python Numwork. These functions can be recognized by their names which all begin with `CGEXT_`:
+
+- `CGEXT_Enable_Wide_Screen()`: Enables the fxCG wide screen, no settings are necessary. The x-coordinates of the physical screen can be negative to encroach on the left white stripe and greater than 319 pixels to encroach on the right white stripe;
+
+- `CGEXT_Disable_Wide_Screen()`: Cancels the activation of the fxCG extended screen, no settings are necessary. The x coordinates of the physical screen will be constrained between 0 and 320 pixels. Beyond that, the route will not be carried out.
+
+- `CGEXT_Is_Wide_Screen_Enabled()`: Returns `True` if the extended screen is active and `False` otherwise.
+
+Note 1: after having made a plot in the extended area, it must be active to allow its deletion (typically via a call to the `fill_rect()` function with the appropriate parameters).
+
+Note 2: In non-extended mode (by default when initializing the `Kandinsky` module) the screen coordinates go from (0,0) to (319,221) centered on the fxCG screen. In extended mode, the screen coordinates range from (-38,-1) to (358,223).
+
+
+## `ion`
+
+The `ion` module gives access to the `keydown(k)` function which returns True if the key k placed as an argument is pressed and False otherwise.
+
+The “conversion” of the keys between the Numworks machine and Casio fxCG50 is done according to the following mapping:
+
+| Numworks | Casio fxCG50 |
+|----------|--------------|
+| KEY_LEFT     | KEY_LEFT |
+| KEY_UP     | KEY_UP |
+| KEY_DOWN     | KEY_DOWN |
+| KEY_RIGHT     | KEY_RIGHT |
+| KEY_OK      | KEY_F1 |
+| KEY_BACK        | KEY_EXIT |
+| KEY_HOME        | KEY_MENU |
+| KEY_ONOFF       | KEY_ACON |
+| KEY_SHIFT     | KEY_SHIFT |
+| KEY_ALPHA     | KEY_ALPHA |
+| KEY_XNT     | KEY_XOT |
+| KEY_VAR     | KEY_VARS |
+| KEY_TOOLBOX     | KEY_OPTN |
+| KEY_BACKSPACE       | KEY_DEL |
+| KEY_EXP     | KEY_EXP |
+| KEY_LN     | KEY_LN |
+| KEY_LOG     | KEY_LOG |
+| KEY_IMAGINARY       | KEY_F2 |
+| KEY_COMMA     | KEY_COMMA |
+| KEY_POWER     | KEY_POWER |
+| KEY_SINE        | KEY_SIN |
+| KEY_COSINE      | KEY_COS |
+| KEY_TANGENT     | KEY_TAN |
+| KEY_PI      | KEY_F3 |
+| KEY_SQRT        | KEY_F4 |
+| KEY_SQUARE     | KEY_SQUARE |
+| KEY_SEVEN       | KEY_7 |
+| KEY_EIGHT       | KEY_8 |
+| KEY_NINE        | KEY_9 |
+| KEY_LEFTPARENTHESIS     | KEY_LEFTP |
+| KEY_RIGHTPARENTHESIS        | KEY_RIGHTP |
+| KEY_FOUR        | KEY_4 |
+| KEY_FIVE        | KEY_5 |
+| KEY_SIX     | KEY_6 |
+| KEY_MULTIPLICATION      | KEY_MUL |
+| KEY_DIVISION        | KEY_DIV |
+| KEY_ONE     | KEY_1 |
+| KEY_TWO     | KEY_2 |
+| KEY_THREE       | KEY_3 |
+| KEY_PLUS        | KEY_ADD |
+| KEY_MINUS       | KEY_SUB |
+| KEY_ZERO        | KEY_0 |
+| KEY_DOT     | KEY_DOT |
+| KEY_EE      | KEY_F5 |
+| KEY_ANS     | KEY_NEG |
+| KEY_EXE     | KEY_EXE |
+
+Note: the `keydown(k)` function can theoretically be called on `Numworks` with the corresponding key number (for example 12 for the `KEY_ONOFF` key), but this is not supported by PythonExtra. It is therefore appropriate to explicitly name the keys via their code `KEY_xxx`.
+
+
+## `time`
+
+The `time` module gives access to two functions:
+
+- `monotonic()`: Returns the clock value at the time the function is called.
+
+- `sleep(t)`: Suspends execution for t seconds.