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Forums > C64 Coding > D017 stretch

2017-01-31 09:47

Trash

Registered: Jan 2002
Posts: 122

D017 stretch

I have a little while trying out som d017-stretching-code-magic-stuff. It seems impossible to stretch sprite 00 when it is alone a raster row.
Can anyone confirm it is possible or tell med where I am going wrong? I just cant get the timings right and I've tried all combinations (I think?).

I've put 1 -> d017 on all cycles after dec $d016 and then 0 on all cycles after that but for me it seems impossible...

Any help at all would be greatly appriciated!

lda #1
ldy #8
-		dec $d016		;  6 Removes the border
		cmp #$c9
		sta $d017		; Has been moved around
		cmp #$c9
		bit $ea
		sty $d017		; Has been moved around
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		cmp #$c9
		sty $d016		; Makes sure the border is removable
		inx
		cpx #15
		bne -

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2017-02-01 11:42

Compyx

Registered: Jan 2005
Posts: 631

Thanks Graham,

That explains the sprite 0 nastiness a lot better than I did :)

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