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Broken H-Blank HDMA Function #855

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SnDream opened this issue Aug 12, 2017 · 2 comments
Closed

Broken H-Blank HDMA Function #855

SnDream opened this issue Aug 12, 2017 · 2 comments
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platform:GB/GBC Game Boy/Game Boy Color-related issues severity:minor bug Issues that only have a minor impact on the library
Milestone
mGBA 0.6.1

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@SnDream
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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
@SnDream
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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.

endrift added a commit that referenced this issue Aug 12, 2017
@endrift
GB Memory: Fix HDMA count starting in mode 0 (fixes #855)
e80a241
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endrift commented Aug 12, 2017

Thanks for finding this.

@endrift endrift added platform:GB/GBC Game Boy/Game Boy Color-related issues severity:minor bug Issues that only have a minor impact on the library labels Aug 12, 2017
@endrift endrift added this to the mGBA 0.6.1 milestone Aug 12, 2017
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platform:GB/GBC Game Boy/Game Boy Color-related issues severity:minor bug Issues that only have a minor impact on the library
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