I have an idea to play GBA on Slot 1

[arctic_flame]

So.. if you could make the DS stays in "DS Mode".. just a thought.. DS games also access the ARM7 cpu, so if you could change a gba rom into a DS rom (a DS rom with no ARM9 code, just ARM7), then.. the game could work..

No.

The ARM7 is used for input and sound whilst in DS mode. It's not going to happen.

Just a note: The official DS devkit (AFAIK) doesn't allow developers to use the ARM7. Which is why nearly all games use pretty much the same (not exactly the same) ARM7 binary, which is why you can swap the ARM7 binaries of commercial games, and they still work.
devkitARM allows you to use both CPUs, but you're still going to need something watching the input registers.

 

[xalphax]

even if.. there is still the slot1 speed issue remaining...

 

[arctic_flame]

It's not really just the slot 1. MicroSDs use a serial interface which is by definition, slow

 

[CockroachMan]

So.. if you could make the DS stays in "DS Mode".. just a thought.. DS games also access the ARM7 cpu, so if you could change a gba rom into a DS rom (a DS rom with no ARM9 code, just ARM7), then.. the game could work..

No.

The ARM7 is used for input and sound whilst in DS mode. It's not going to happen.

Just a note: The official DS devkit (AFAIK) doesn't allow developers to use the ARM7. Which is why nearly all games use pretty much the same (not exactly the same) ARM7 binary, which is why you can swap the ARM7 binaries of commercial games, and they still work.
devkitARM allows you to use both CPUs, but you're still going to need something watching the input registers.

can't see why not.. it's used for input and sound only for convention.. technically, there's nothing that keeps you from using it for other operations..

 

[arctic_flame]

I just realised I made a mistake: it seems the ARM9 handles key input in NDS mode. But you're wrong otherwise, the ARM9 physically has no access to sound, etc. It's just not feasible. Just get a Slot-2 card and be happy.

 

[CockroachMan]

So.. you would need to change some arm7 code into arm9 code to change a GBA rom into a NDS one.. and run it in a Slot1 device..
It's not impossible.. but I don't think it's worth..

 

[mkoo]

in soviet russia the ds has enough power to do that

In Soviet Russia GBA emulates DS!