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January 22nd, 2002, 8:18am


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Topic Summary
Posted by: Lalli Posted on: October 24th, 2001, 2:01pm
Why does a GBC binary file that has been written to a FA flash card made for GBA not run on the GBA when GBC cartridges work ?

How does the GBA sense the differense of GB and GBA carts ?

How do the GB cartridges work on the GBA, does the ARM emulate the GB HW or is the old CPU in the GBA to ?

Electronic difference between carts have nothing to do with the binary that is stored on them so I must asume that you could store GB binaries and then activate the GB emulation.

I have seen all kinds of answers were lack of knowlage is hidden behind "common sense" answers on these questions but I would like to see some real answers with details.

Thanks
Posted by: Snubber Posted on: November 12th, 2001, 7:50pm
From what I understand the gba contains an original Z80 chip in it, commonly found in the gbc and gb.  If you look at your GBA carts you will see a little notch in the casing next to the connector.  This notch prevents the cart from hitting a *physical* switch in the gba which, i belive, toggles between gb/gba.  I have not seen any evidence of a software style switch.  I think the only hope would be to write an actual emulator for the gba (most likely buggier than original hardware).
Posted by: Lalli Posted on: November 12th, 2001, 11:34pm
Hi, thanks for the reply

That would make sense, I don't know if the new GB Bridge has any electronics or just the switch/sensor notch, and shutting the power of the CPU that is not in use would make sense for power preservation.

But on http://www.gbaemu.com/ I saw that someone is writing a GB emulator for the GBA, it could be buggy but if it does the same job as the PocketNes 5 it will be good enough.


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