[LocalH]

Don't forget "dynamic hires" and "sliced HAM", two software modes that were really only useful for static images.

Dynamic hires ran at 640x400x16 colors, but changed the palette on every single scanline, which could allow display of all 4096 colors in hires). Sliced HAM did the same thing, but in 320x400 HAM (the base palette was 16 colors and could be used directly without fringing, so changing those 16 colors every line would reduce fringing while still allowing more than 16 colors to appear on a scanline).

Nothing stopped people from using this dynamic palette technique with 32-color lores or 64-color EHB as well. But it was most commonly used in the two forms I mentioned.

By the time HAM8 came around in the AGA chipset, this wasn't really needed, as HAM8 fringing was much less noticeable, having a base palette of 64 colors. There's no reason you couldn't do sliced HAM8 however, although I'm not sure if you could change all 64 base colors for each scanline.