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GB key IRQ always happens at the same LY #114

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pinobatch opened this issue Jan 21, 2023 · 0 comments
Open

GB key IRQ always happens at the same LY #114

pinobatch opened this issue Jan 21, 2023 · 0 comments

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@pinobatch
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A program can tell that it's running on Mesen-S because the key IRQ always happens right at vblank.

Environment: Mesen-SX Linux build #25 (built from c85dd78) on Mono 6.8.0.105 on Xubuntu 22.10

To reproduce:

  1. Run Mesen-SX in Game Boy or Game Boy Color mode
  2. Start the attached test ROM "Telling LYs?" tellinglys-0.02.zip
  3. Press all 8 buttons in any order
  4. Watch the arrow sprite at the right side

Expect: Arrow moves after each press, followed by "Pass", as on DMG, CGB, DOL-017, and BGB emulator

Actual: Arrow stays half off the bottom of the screen, followed by "Incorrect behavior: Emulator fires joypad interrupt at same line each time"

Super Game Boy mode doesn't even get past the title screen, which I reported as issue #113.
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@pinobatch