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95 lines
2.6 KiB
Markdown
95 lines
2.6 KiB
Markdown
[< back to index](../doc_index.md)
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Definitions on the following list are frequently provided by the default automatically-imported modules.
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However, as they are not the part of the standard library, they might not be available on all targets:
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#### `void init_rw_memory()`
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Initializes all writable arrays and variables with their initial values.
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If the preprocessor feature `INIT_RW_MEMORY` is defined and non-zero,
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then `init_rw_memory` is available and should be called before accessing any preinitialized writable object.
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If the preprocessor feature `INIT_RW_MEMORY` is not defined or is zero,
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then `init_rw_memory` is not available.
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#### `void putchar(byte char)`
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Prints a single character.
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Available for: all computer targets.
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Uses ROM routines, so requires the appropriate ROM to be enabled if applicable.
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Note that this function may obey typical platform idiosyncrasies, for example:
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* on Commodore PET targets the quote character toggles the quotation mode
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* printing past the end of line might insert a blank line below the current one
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* printing past the end of the screen might ask the user to confirm scrolling
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The exact behaviour is platform-dependent.
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Future library versions will strive to eliminate those issues.
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#### `void new_line()`
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Moves the cursor to the next line.
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Available for: all computer targets.
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Uses ROM routines, so requires the appropriate ROM to be enabled if applicable.
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#### `pointer readline()`
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Reads a line from the console and returns a pointer to a null-terminated string.
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The string is valid only until next read from the console.
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Available for:
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ZX Spectrum,
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NEC PC-88,
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MSX,
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Apple II,
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Commodore 64 with `c64_basic` module (requires KERNAL and BASIC),
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Commodore 16 or Plus/4 with `c264_basic` module (requires KERNAL and BASIC).
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#### `word readword()`
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Reads a 16-bit unsigned integer from the console.
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Available for:
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ZX Spectrum,
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NEC PC-88,
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MSX,
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Apple II,
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Commodore 64 with `c64_basic` module (requires KERNAL and BASIC),
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Commodore 16 or Plus/4 with `c264_basic` module (requires KERNAL and BASIC).
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#### `void bell()`
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Beeps.
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Available for: Apple 2, ZX Spectrum.
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Uses ROM routines, so requires the appropriate ROM to be enabled if applicable.
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#### `void set_bg_color(byte color)`
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Sets the screen background color.
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Available for: C64, VIC-20, C64, C128, C264 series.
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#### `void set_border(byte color)`
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Sets the screen border color.
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Available for: VIC-20, C64, C128, C264 series, ZX Spectrum.
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#### `const byte black, white, red, green, blue, cyan, purple, yellow`
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Various colour constants.
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Available for: VIC-20, C64, C128, C264 series, ZX Spectrum.
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