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    GBA Scene >> GBA Discussion Board >> Message started by: Lalli on 11/12/01 at 23:34:47

Title: More on GBC binary on FA
Post by: Lalli on 10/24/01 at 14:01:30

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

Title: Re: More on GBC binary on FA
Post by: Snubber on 11/12/01 at 19:50:42

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).

Title: Re: More on GBC binary on FA
Post by: Lalli on 11/12/01 at 23:34:47

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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