Productions tagged 'c64-fli-mode'
Flexible Line Interpretation (FLI) mode generates same resolution as standard MultiColor mode - 160x200 pixels/16 colors. This technique allows to use more colors in the attribute cell. It allows artist to use the full palette of 16 colors in each 4x8 pixel big attribute cell. It's realized by a special routine, which by changing values in the VIC register $D011 causes that Bad Scan Line (In further text called Caroline*) is on each rasterline of visible screen. For those who don't know what a "Caroline" is: Caroline occur each 8th rasterline. It's the time when the graphical processor of C64 (VIC) is loading graphic data from memory. Bits 0-2 of the $d011 register (the VIC Control register) are used for the vertical smooth scrolling. Bad scan line happens.when the bits 0-2 of register $d011 are same as the bits 0-2 of register $d012 (raster-beam position register). In FLI, a Caroline happens on each raster line of the graphic screen. This means that VIC reads the values from attribute screens each rasterline, not only each 8th as it normally does. Then, when you change the $d018 register on each rasterline, in order to change an attribute screen, it is done. You can use 4 colors in each 8x1 pixels big attribute area. Special version of FLI is the HiRes FLI, which uses the same principles in HiRes mode. It allows graphician to use 2 colors (the background and foreground color) in 1x8 pixels big attribute area. Description abbreviated from Studiostyle.sk.
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