__asm
        ;; disable interrupts
        di
        ;; save stack pointer
	ld hl,#0
	add hl,sp
	ld (_tmp0),hl
	ld sp,#(_address_of_screen_line + 400)

	;; compute

        ;; b = 0xC8 = 200
        ;; c = 0x40 = because one has to go back 0x40.
	ld bc,#0xC840
        ;; de = how far to advance (has to be 16bit operation)
	ld de,#0x0050
        ;; hl = address of current line
	ld hl,#0xC000
        ;; now loop
0001$:
        ;; write value in table
        push hl
	; ld (hl),h
        ;; a = high byte of address of current line
        ld a,#8
        ;; add a,h sets carry
	add a,h
        ;; ld h,a keeps carry
	ld h,a
        ;; no carry means simple case
	jr nc,0002$
        ;; here overflow we have to go back
	sub c
        ;; then add alternate (has to be 16 bit add)
	ld h,a
	add hl,de
0002$:
        ;; Here,a is available for comparison.
        ld a,#0xC7
        cp h
        jr nz, 0001$
        ld a,#0xD0
        cp l
        jr nz, 0001$

        ;; restore stack pointer
        ld hl,(_tmp0)
        ld sp,hl

        ;; re-enable interrupts
        ei
0003$:
	__endasm;