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PostPosted: Tue Mar 10, 2009 10:25 pm 
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Location: Missouri
Any idea how the Zelda Oracle games know if they're running on GBA? A GBA game can detect NDS by using the bios checksum software interrupt, but the Gameboy/GBC doesn't have software interrupts. Maybe they added a new IO area to the GBC hardware inside the GBA just for that purpose.


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PostPosted: Wed Mar 11, 2009 12:23 am 
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They check if bit 0 of register B is set on startup. If it is, then it's on GBA.


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PostPosted: Wed Mar 11, 2009 12:35 am 
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They also "brighten" the screen colors, making everything faded and white, and horrible looking on a GBA-SP, in order to compensate for the original GBA's terrible screen.

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