Library improvements

docs/stdlib/frequent.md

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+[< back to index](../index.md)
+
+Definitions on the following list are frequently provided by the default automatically-imported modules. 
+
+However, as they are not the part of the standard library, they might not be available on all targets:
+
+#### `void putchar(byte char)`
+
+Prints a single character.
+
+Available for: all computer targets.
+
+#### `void new_line()`
+
+Moves the cursor to the next line.
+
+Available for: all computer targets.
+
+#### `void bell()`
+
+Beeps.
+
+Available for: Apple 2, ZX Spectrum.
+
+#### `void set_bg_color(byte color)`
+
+Sets the screen background color.
+
+Available for: C64, VIC-20, C64, C264 series.
+
+#### `void set_border(byte color)`
+
+Sets the screen border color.
+
+Available for: VIC-20, C64, C264 series, ZX Spectrum.
+
+#### `const byte black, white, red, green, blue, cyan, purple, yellow`
+
+Various colour constants.
+
+Available for: VIC-20, C64, C264 series, ZX Spectrum.
+