Available on: c128 c64 vic20 atari plus4
See also: COLOR SHADES (constant) RGB

COLOR BACKGROUND

The COLOR BACKGROUND command allows you to redefine the color used by the graphics chipset for the background, where this is possible. "Redefinition" means assigning one of the possible colors to specific registers called "palette registers".

On some systems this is not possible at all, due to limitations of the chipset or the absence of registers: for this reason, in such cases the command is ignored. On other systems this corresponds to the modification of specific registers, to which one of the available colors is assigned. On others it is possible to assign certain shades, which therefore go beyond the number of available colors.

Where it is possible to assign a shade, the value can range from 0 to the constant SHADES. However, it may be more practical to use the RGB function, which allows you to calculate the shade starting from the color components (red, green and blue).

syntax example abbreviation back to keywords

SYNTAX

 COLOR BACKGROUND value
 COLOR BACKGROUND index TO value


Legend
  • id : identifier
  • type : datatype
  • v : value
  • "..." : string
  • [...] : optional

ABBREVIATION: CrBg

Join BASIC 10Liner Contest with ugBASIC!

An interesting competition is held at the beginning of each year: the BASIC 10Liner Contest. It is possible to use ugBASIC to participate in the next "BASIC10Liner" competition, in the following categories:

  • PUR-120 - A game in 10 lines of max 120 characters (w/abbrev.)
  • EXTREME-256 - A game in 10 lines of max 256 characters (w/abbrev.)
  • SCHAU - Any program in 10 lines of max 256 characters (w/abbrev.)
In order to reduce space you can use this abbreviation for this instruction: 

COLOR BACKGROUND ↔ CrBg

Any problem?

If you have found a problem with this keyword, if you think there is a bug or, more simply, you would like it to be improved, open an issue for this example on GitHub.
Thank you!

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