You could change the stack pointer to the top of the area of memory you wanted to fill and then use PUSH to fill at I think 11 clock cycles per two bytes. It wa

You could change the stack pointer to the top of the area of memory you wanted to fill and then use PUSH to fill at I think 11 clock cycles per two bytes. It was faster than unrolled LDI or LD (HL),A followed by INC HL. It would be filling memory in the wrong direction for a Rainbow processor but you could use it for repeating patterns. I think I did a checkerboard pattern that would shift every frame and it was pretty smooth.