Points

PLOT a point (by altering screen memory)
Plots a single point using screen co-ordinates. The x and y co-ordinates should be loaded into registers D and C.

ld c,8 ld a,175 sub e       ret c	ld e,a and a	rra scf rra and a	rra xor e	and 248 xor e	ld h,a ld a,d rlca rlca rlca xor e	and 199 xor e	rlca rlca ld l,a ld a,d and 7 ld b,a inc b	ld a,254 loop	rrca djnz loop ld b,255 xor b	ld b,a ld a,(hl) or b	ld (hl),a shit