GBA program that enters GBC mode.

[wraggster]

New from DWedit:

Here's a little GBA program that enters GBC mode.
Newer version! Press A to enter GBC mode!
Includes source code.

Download Here

[DanTheManMS]

Just a few notes from the PocketHeaven thread this originated from:
1. Only works on GBA, GBA SP, and GBM. Not the DS Phat or DS Lite.
2. On a GBA or GBA SP you'll hear the sound but you won't get any video. On a GBM you'll get both sound and video
3. Modifying a GBC cartridge to not press the internal switch and then running this program doesn't work, so you cannot use it to run GBC games on a GBM. That was the intention, but it didn't work.

Interestingly enough, the entire reason this came about was from a bug in Goomba Color's saving system that crashed GBM systems into showing the GBC BIOS.

[otto_xd]

It may be useful tu run gbc games in gba & gbaSP with a flash card, no?

Sorry for my bad english

[mcdougall57]

i have a gbm and a flash cart can i use this to run gbc games?

[Eyedunno]

i have a gbm and a flash cart can i use this to run gbc games?

Wow, yeah, I want to know this too. I thought GBM was also incapable of playing GBC games.

[acn010]

sorry but its useless for me.

[Hypershell]

i have a gbm and a flash cart can i use this to run gbc games?

I suggested that a while back on PocketHeaven (this program was actually done in January), and this is where the conversation went:

Dwedit: As far as I know, the GBC and GBA use a different protocol on the cartridge bus. You'd need a card which would perform the reads and writes the same way as a GBC cartridge.
tepples: True, but the GBC protocol is similar to the GBA SRAM protocol, with about three or four enable lines switched around. I'd bet that's how the Flash2Advance GB Bridge got away with it. If someone's serious about this, I'd recommend taking a logic analyzer, logging the startup sequence of a GBC, and logging the same parts of the startup sequence of a micro that has crashed into GBC mode.

That was written before Dwedit released the program, hence the "crash" part.

As far as I know it hasn't gone anywhere from there. The only attempts at running a GBC game that I'm aware of were cutting legitimate cartridges, which failed. I'm not sure if anyone has yet attempted this with a flash card or not.

[DanTheManMS]

If you've got a GBM and a flash cart, just use Goomba Color to emulate the GBC games. This program, while interesting, doesn't accomplish too much.

[mcdougall57]

goomba? do save files work now? last version i tried you couldnt save your games on it

[DanTheManMS]

I don't recall there ever being a version you couldn't save in...

Savestates are broken in Goomba Color, but in-game saving still works.