Subject: RE: skipdraw from Eric Ball WAS: [stella] Finally underway: 2600Cookbook From: "Erik Mooney" <erik@xxxxxxxxxx> Date: Tue, 13 Apr 2004 10:22:31 -0500 |
KirkIsrael@xxxxxxxxxxxxx wrote: > -exact horizontal positioning > -indirect referencing for changing player graphics This post gives a detailed explanation of exact horizontal positioning: http://www.biglist.com/lists/stella/archives/199804/msg00170.html Unfortunately, I discovered while writing RRampage that that table has been wrong all along! It doesn't work for an X position of 7 or lower, because then the RESP0 completes at cycle 21, which is still during HBLANK and so the object ends up in the wrong place. (INV doesn't position any objects there so I never noticed it.) I have a version now that corrects that; the code also needs to burn two extra cycles (NOP) before starting the delay loop. I'll write this up later tonight to send to you, Kirk. I can do a decent writeup of indirect-indexed graphics loading as well. ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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