1 ; http://www.retroprogramming.com/2014/03/plotting-mandelbrot-set-on-zx-spectrum.html
17 ld hl,-180 ; x-coordinate
24 ld hl,-96 ; y-coordinate
59 cp 46 ; 46 ? 2 x 2 << 4
65 db 254 ; trick to skip next instruction
74 FIXMUL: ; hl = hl x de >> 24
84 SCALE: ; bc = (hl + e) x zoom
89 MULT16BY16: ; hl:bc (signed 32 bit) = hl x de
125 MULT8BY16: ; returns a:hl (24 bit) = a x de
138 PLOT: ; plot d = x-axis, e = y-axis
170 ABSVAL: ; returns hl = |hl| and increments
171 bit 7,h ; a if the sign bit changed