Subject: RE: [stella] RESPx and player positions From: "John Saeger" <john@xxxxxxxxxxx> Date: Mon, 20 Apr 1998 19:13:31 -0700 |
> I've always wondered about these delays anyone have an idea why they're > there? Also while writing Stella (the emulator) I noticed that Atlantis > seems to position the left most gun during HBLANK so you would expect it > to appear at pixel 0, however, they reposition the player ~3 > pixels to the > left. This seems to imply that it really positions it at pixel 3 and not > pixel 0 like the Stella Programming Guide says. To see what I mean fire > Atlantis up under PCAE and notice that the left gun is half-way off the > screen. Nah. I think the gun is *really* at position zero. I think the HMOVE is spurious; a bug that turns out not to matter. You know, fiddle with it until you get it right, and who cares how you got it there... ;-) Sword Quest Earthworld has something like this in the opening screen too. PCAE shows part of the handle on the right side of the screen. I think it has something to do with trying to do an HMOVE which results in a position less than zero, or something like that. I think a real VCS ignores any such request and puts it at zero. But I'm just guessing... ;-) But so far, I'm a firm believer in the RESP during HBLANK putting the object at zero theory. Does ANYONE know of ANY exceptions?? John -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html
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