Displays the poked bitmap mem_bitmap at the coordinates coords on the screen pointed to by address using one single color (color).
It only displays the non-zero pixels, allowing semi-transparent effects.
mem_bitmap must be a returned sequence from poke_bitmap().
address can either be the address to the real screen (#A0000) or an address to a virtual screen created by allocate(64000).
color can be any 8-bit value. That is, 0-255.