Subject: RE: [stella] New demo, skipdraw with isb From: "Dennis Debro" <dennis@xxxxxxxxxxxxxxx> Date: Fri, 12 Nov 2004 06:22:34 -0500 |
Hi Aaron, > The main thing of interest I guess is that I've used a variant of skipdraw > with the isb instruction (inc, sbc) instead of the usual dcp, i.e. > > lda #SPRITEHEIGHT > sec > isb SpriteEnd > bcc .skipDraw Could you supply the source too? I'd like to see how this benefits your situation. Are your sprites not stored upside down in ROM? > The nice thing is that it leaves the a register with useful information > that you can use to draw the sprite. In the dcp version you need to > reload the value out of SpriteEnd, Huh? Wouldn't SpriteEnd been an offset for your sprite? Take care, Dennis
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