Flexible Line Interpretation

Flexible Line Interpretation (FLI) refers to a family of nonstandard graphics modes, and associated file formats, used on the Commodore 64 and other computers that use the VIC graphics chip. Hacks are used to transcend some of the limitations of the standard graphics modes, particularly the restrictions on how many different colors can be displayed in a character-sized cell.

An image to be displayed using FLI may be bundled with a viewer in an executable (.PRG) file, or it may use a standalone image file format.

Specific formats

 * BFLI
 * FFLI

[TODO: There are many more FLI formats.]

Software

 * RECOIL
 * http://www.zimmers.net/anonftp/pub/cbm/c64/graphics/viewers/

Sample files

 * http://www.zimmers.net/anonftp/pub/cbm/c64/graphics/pictures/FLI/
 * examples.zip includes some FLI files

Links

 * C64 Graphics Modes
 * Codebase 64 wiki: C64 Graphics File Format Specs