Vic20
HiUxLife for the Unexpanded VIC-20
Colour MandleBrot for the Unexpanded VIC-20 (UxMand)
There were overflow errors in the original calculations which I resolved using some additional edge case tests and now I can generate a much better image.
In addition I speeded up the multiplication calculation by combining the shifted Multiplicand with the 32-bit result (which gets shifted on each pass). This means the entire image is generated in 4:09mins instead of 5:49mins.