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Broken H-Blank HDMA Function #855

SnDream opened this Issue Aug 12, 2017 · 2 comments


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SnDream commented Aug 12, 2017

When writing $81 into $FF55, HDMA may send 30h bytes but not 20h bytes.
Wrting $82 may send 40h bytes and only $80 work correctly.
Other value untested.

Version: 0.6.0
Platform: Ubuntu 17.04 and Windows 7


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SnDream commented Aug 12, 2017

When writing into $FF55 between STAT mode 00, HDMA may send extra 10h bytes.
From Nintendo's Official Promramming Manual that HDMA should not be started at STAT mode 00 but official game Pocket Monsters Geum/Eun (Korea) does that and cause glitch on screen.


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endrift commented Aug 12, 2017

Thanks for finding this.

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