BASIC week 6 challenge on a Kaypro II

For absurdity, I’m displaying the BASIC week 6 “Mandelbaum“ program on a 386DX, but making a Kaypro II (Z80) do the heavy lifting. The Kaypro II sends coordinates via serial @ 1200bps to the 386, which plots it on a 640x480 display. 13 1/2 hours to complete.