GBC boot code support

aceloop · Post by **aceloop** » Sun Aug 23, 2009 1:22 pm

was the gameboy color BIOS ever dumped or ????? :angel:

Squall Leonhart · Post by **Squall Leonhart** » Sun Aug 23, 2009 1:33 pm

Nope.

spacy51 · Post by **spacy51** » Sun Aug 23, 2009 1:52 pm

Would be great to have that start animation though...

C. V. Reynolds · Post by **C. V. Reynolds** » Mon Aug 24, 2009 2:42 am

I was actually just about to ask about the GBC bios when I found this.

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So, the GBC used different bios than the GB, then?

Squall Leonhart · Post by **Squall Leonhart** » Mon Aug 24, 2009 4:27 am

Yes, it also stores several predefined colour palettes for non colour capable GB games to use.

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unfortunately, nobody has ever sacrified a GBC in order for us to get a binary (if possible) reading of the chip.

aceloop · Post by **aceloop** » Mon Aug 24, 2009 9:11 am

Squall i don't think it was that, i think it was the fact that it was very hard to dump it.

Exophase · Post by **Exophase** » Mon Aug 24, 2009 1:45 pm

It's a part of the CPU die like it was on the original Gameboy, it can't be dumped short of a CPU exploit that probably would have turned up by now if it existed. The only way to get it is to decap it (burn off the chip packaging) and take pictures of the transistors under a microscope, then use software and/or hand techniques to convert this to data. That's what they did with the Gameboy, and I believe this has been done with some other chips. Last I heard an 8192 byte ROM was considered very difficult to learn by decapping, but I think things might have changed since then.

Squall Leonhart · Post by **Squall Leonhart** » Tue Aug 25, 2009 3:55 am

i think there are programs that can analyse binary images from a chip, as long as the image is good enough quality.

chrono · Post by **chrono** » Tue Sep 29, 2009 5:41 am

FPGABoy :: Gameboy Color Boot ROM

bgK · Post by **bgK** » Tue Sep 29, 2009 5:52 am

Yeah !

Works ok, with a few changes, in vba-m !

Ok, I'm not too sure of what I did, so here is the patch for review.