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| Acmlm's Board - I3 Archive - The Pit of Despair - NES Scrolling |
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DahrkDaiz Nipper Plant U wan hax Mario?!                  Since: 11-17-05 Last post: 6297 days Last view: 6296 days |
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| I'm doing some work on a game (those who know, butt SSSHHH!!)
Anywho, the scrolling works grand, that is, until the scrolling wraps around in value (from FF to 00) then the upper half of the screen gets awfully screwy and you see scanline glitches in the upper half of the screen. I'm assuming it has something to do with name tables because when the game goes to wrap around a second time, the scrolling fixes just fine. |
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Disch Red Cheep-cheep   Since: 12-10-05 Last post: 6575 days Last view: 6575 days |
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| I tried to explain what I thought the problem was on IRC, but you must have missed it.
Anyhoo: I believe your IRQ counter is the culprit. IIRC you said you had your IRQ reset stuff right at the start of NMI, then you had the game do it's normal stuff -- however the game can "accidentally" make the IRQ counter falsely count by doing certain writes to $2006 .. which it probably does when drawing at that specific area of the nametable. I say, try moving your IRQ counter reset code so that it's after all the game's drawing stuff. |
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DahrkDaiz Nipper Plant U wan hax Mario?! Since: 11-17-05 Last post: 6297 days Last view: 6296 days |
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| I doubt it's the IRQ because the IRQ now fires off at scanline 31 each and everytime. Im thinking it's nametable issues. |
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