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Madden NFL 06 and Madden NFL 07: graphical bugs on the 'coin toss' screen #190

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angrylion7 opened this issue Dec 17, 2015 · 4 comments
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Madden NFL 06 and Madden NFL 07: graphical bugs on the 'coin toss' screen #190

angrylion7 opened this issue Dec 17, 2015 · 4 comments
Labels
platform:GBA Game Boy Advance-related issues severity:holy grail Issues that affect all emulators severity:minor bug Issues that only have a minor impact on the library
Milestone
mGBA 0.9.0

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@angrylion7
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In both games the coin toss screen is utterly broken, at least in v0.3.2. To get there it's enough to select 'new game' and proceed. This video shows what it should look like:
http://www.youtube.com/watch?v=PR3sMHeuOcI
This problem exists in many emulators. VBA bug report:
https://sourceforge.net/p/vba/bugs/182/

Quote:
"It's due to a swi taking a of time for some reasons (because
it's writing to vram during display ?), and it seems pretty
harsh to emulate."
@endrift
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endrift commented Dec 18, 2015

Looks like what's going on is that BG2PD gets set to 0x100 (correct), and then, via a DMA, set to 0, which causes the smear. What needs to happen is that the DMA should be disabled before BG2PD gets written. The DMA is disabled on the interrupt right after BG2PD gets written first, instead of before.

Not sure what's causing these to be ordered wrong.

@endrift endrift added the severity:minor bug Issues that only have a minor impact on the library label Dec 18, 2015
@taisel
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taisel commented Jan 20, 2016

Is this broken in every emulator? I swear to god if this is one of those subcycle glitch timing issues.

@endrift endrift added this to the 0.4.1 milestone Jan 23, 2016
@endrift endrift modified the milestones: 0.5.0, 0.4.1 May 23, 2016
@endrift endrift added the platform:GBA Game Boy Advance-related issues label Jun 24, 2016
@endrift endrift modified the milestones: 0.5.1, 0.5.0 Aug 8, 2016
@endrift endrift modified the milestones: 0.5.1, 0.5.2 Sep 27, 2016
@endrift endrift mentioned this issue Dec 23, 2016
Closed
@endrift endrift modified the milestones: 0.5.2, 0.6.0 Dec 31, 2016
@endrift endrift modified the milestones: 0.6.0, 0.6.1 Apr 22, 2017
@endrift endrift modified the milestones: mGBA 0.6.1, mGBA 0.6.2 Sep 21, 2017
@endrift endrift modified the milestones: mGBA 0.6.2, mGBA 0.7.0 Jan 15, 2018
@endrift endrift modified the milestones: mGBA 0.7.0, mGBA 0.8.0 Apr 22, 2018
@endrift endrift added the severity:holy grail Issues that affect all emulators label Mar 1, 2019
@endrift endrift removed this from the mGBA 0.8.0 milestone Sep 19, 2019
@endrift endrift added this to the mGBA 0.9.0 milestone Sep 19, 2019
@RobertPeip
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Hopefully you can fix it, too.
Have written something for it here:
https://github.com/RobertPeip/FPGBA/wiki/Madden-06-07-%22Holy-Grail%22-Bug

@endrift
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endrift commented Jun 30, 2020

Still some polish left to be done, but the simple case is fixed at least.

RetroEdit pushed a commit to TASEmulators/mgba that referenced this issue Aug 29, 2020
@endrift @RetroEdit
GBA Memory: Stall on VRAM access in mode 2 (fixes mgba-emu#190)
a581f38
vadosnaprimer pushed a commit to TASEmulators/mgba that referenced this issue Aug 30, 2020
@endrift
GBA Memory: Stall on VRAM access in mode 2 (fixes mgba-emu#190)
04aa422
portableandroid pushed a commit to portableandroid/mgba that referenced this issue Sep 7, 2020
@inactive123
Merge pull request mgba-emu#190 from fjtrujy/master
3dc44e3 
Adapt PS2 port to latest SDK status
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Labels
platform:GBA Game Boy Advance-related issues severity:holy grail Issues that affect all emulators severity:minor bug Issues that only have a minor impact on the library
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Milestone
mGBA 0.9.0
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@endrift @taisel @angrylion7 @RobertPeip