Posted By
IstvanV
on 2011-03-21
18:32:13
|  Re: Converting gfx made on PC
I think "DFLI" refers to the limitation of being able to implement FLI only for pairs of lines, or "double" FLI. This is caused by the different way of fetching attribute data on the Plus/4 compared to the C64: the VIC-II can read all in a single line using a separate 4-bit color RAM and a 12-bit data bus, while the TED needs two lines: first the luminance, which is displayed only after a delay of one line, and then the colors. However, with some restrictions, it is still possible to have FLI in every line on the Plus/4: it is either limited to greyscale (or shades of any other color, which can be different in each column), or the luminance data is also interpreted as color for the "previous" (i.e. where it is actually fetched) line, depending on the timing.
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