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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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Acrobat Kid (J) graphical issue GBA #743

gadesx opened this issue May 22, 2017 · 3 comments
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platform:GBA Game Boy Advance-related issues severity:minor bug Issues that only have a minor impact on the library
Milestone
mGBA 0.7.2

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@gadesx
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gadesx 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 platform:GBA Game Boy Advance-related issues severity:minor bug Issues that only have a minor impact on the library labels May 22, 2017
@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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JMC47 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
@endrift
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endrift 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.

@endrift
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endrift 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 added a commit that referenced this issue May 12, 2019
@endrift
GBA Memory: Prevent writing to mirrored BG VRAM (fixes #743)
a66c45e
@endrift endrift mentioned this issue Jun 10, 2020
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ITotalJustice added a commit to ITotalJustice/notorious_beeg that referenced this issue Mar 28, 2022
@ITotalJustice
add blanking, remove bad assert(), fix is_bitmap_mode(), fixed fixe…
8f2431a 
…d 16/32bit sram region reads, hle CpuSet.

- fixed vram dma overflow bug, thanks to [mgba](mgba-emu/mgba#743).
- hle CpuSet bios (untested, should work though).
- fixed 16/32bit sram region reads by mirroring the single. (ie, 16bit read of 0xFF will return 0xFFFF).
- fix `is_bitmap_mode()` to also include mode5
- refactor io_reads to operate on 16bit reads by default.
- minor refactor of mem.cpp, it's more readable now. io r/w is still a mess atm.
- remove `assert(gba.cpu.halted);` from scheduler. this was left over from debugging scheduler issues in the past.
- blank ppu rendering (memset the screen).
- add std::execution to mode3/mode4 rendering. seems to slightly improve fps (~10fps) but that's within margin of error, so unsure if it has any benefit. though it doesn't harm performance so i've kept it. (this forced my to remove -fno-exceptions as well).
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platform:GBA Game Boy Advance-related issues severity:minor bug Issues that only have a minor impact on the library
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mGBA 0.7.2
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