Subject: RE: [stella] DD Build 0002 From: "Brian Prescott" <bprescot@xxxxxxxxxxxxxxx> Date: Sat, 22 Sep 2001 10:21:44 -0400 |
Glenn: D'oh! Another thing that I have found in my 2600 programming trials and tribulations was that the best place for a problem to hang out is in clear sight. You need to use: LDA #PF_Reflect The emulator just happened to work because the right bits were in memory location 1. Brian -----Original Message----- From: owner-stella@xxxxxxxxxxx [mailto:owner-stella@xxxxxxxxxxx]On Behalf Of Brian Prescott Sent: Saturday, September 22, 2001 10:02 AM To: stella@xxxxxxxxxxx Subject: RE: [stella] DD Build 0002 Glenn: To remove the blip at the top, all I did was move the code: LDA #0 STA PF0 STA PF1 STA PF2; zero out playfield up to right under the STA VBLANK. It must've been a remnant left in PF2 that was drawn on the bottom of the screen, but then again, I'm no expert. I ran the binary through my Supercharger, and I have good news and bad news. The good news is that the screen doesn't roll. The bad news is that the "Derb" comes out backwards on my Atari, while it comes out as expected on z26. I haven't a clue why that would be happening, I looked real quick at the source code and nothing jumped out at me. One thing that I did notice during my Vault Assault development was that I needed to test with the actual Atari somewhat frequently, as I had some nasty bugs work their way into it by just using the emulator only. (By the way, for those of you who own one of the Vault Assault carts, try playing a game where you score exactly 600 points. Don't bother trying it with the binary posted on my web page, though.) Brian -----Original Message----- From: owner-stella@xxxxxxxxxxx [mailto:owner-stella@xxxxxxxxxxx]On Behalf Of Glenn Saunders Sent: Saturday, September 22, 2001 3:34 AM To: stella@xxxxxxxxxxx Subject: [stella] DD Build 0002 I've got the bordering working properly but I have a weird artefact at the top of the screen. Could someone take a look at this and tell me why that's showing up? Also, I adjusted the total scanlines to 200 (most TVs should show the bottom without scrolling off). I want to maximize the active playfield area. Could someone check to make sure it's not generating too many total scanlines (including overscan) per screen? It doesn't roll for me but I want to keep it by the book. Thanks, Glenn Saunders - Producer - Cyberpunks Entertainment Personal homepage: http://www.geocities.com/Hollywood/1698 Cyberpunks Entertainment: http://cyberpunks.uni.cc - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/ - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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