[andybest]

I wonder if a more efficient microcode could be written for the Alto to optimise just for rendering Mandelbrot sets

[kens]

The Alto has up to 3K RAM to hold custom microcode, and some programs used their own microcode for performance. So, yes it would be quite possible to speed up the Mandelbrot set with microcode. But writing Alto microcode is very difficult, so I'm not planning to do that...