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Acrobat Kid (J) graphical issue GBA #743

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gadesx opened this issue May 22, 2017 · 3 comments

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@gadesx
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commented May 22, 2017

I tried the japanese version of Aero the acrobat "Acrobat Kid (J)"
with mGBA 0.5.2 and latest nightly 0.6-4531-29d1da6 (Windows)

Just in title screen, pressing start appear a black line flashing.
Checking tools > Game log says:
"[GAME ERROR] GBA I/O: Read from write-only I/O register: 0DC"

acrobat kid j -0
@endrift endrift added this to the 0.6.1 milestone May 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
@JMC47

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commented Sep 6, 2018 •
edited

Confirmed, latest nightly as of today, Windows 10.
@endrift endrift modified the milestones: mGBA 0.7.0, mGBA 0.7.1 Oct 16, 2018
@endrift endrift modified the milestones: mGBA 0.7.1, mGBA 0.7.2 Feb 25, 2019
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commented May 1, 2019

This appears to be caused by one of the two backgrounds it flips between (which are in theory identical) having a small region of the background blacked out. This causes the flicker.

I haven't yet tracked down why one of them has that line blacked out.
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commented May 8, 2019

This happens because a VRAM DMA into OBJ RAM overflows (goes past 0x06018000) and wraps back around into the mirrored extension of BG RAM (0x06010000+). Will need to do hardware tests to see what the right behavior here is.
@endrift endrift closed this in 0126330 May 10, 2019
endrift added a commit that referenced this issue May 12, 2019
@endrift
GBA Memory: Prevent writing to mirrored BG VRAM (fixes #743)
a66c45e
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platform:GBA severity:minor bug
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  mGBA 0.7.2
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@gadesx @JMC47 @endrift
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