@Crumb
Do many demos use SuperHighRes screens though?
There are some that use static super-hires ham8 screens (TBL's captured dreams for example, Rain too IIRC). Other less frequent effect uses one super-hires pixel for each RGB component and picassoIV*just shows rubbish but I just have seen a pair of "experiments" that used that mode.
PicassoIV still has some advantages on CRT monitors as you can raise AGA refresh to 100Hz easily. I prefer Indivision but PicassoIV flickerfixer is very good.