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Messages - SillyWalks

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1
EverDrive GBA / Re: GBA everdrive question
« on: February 23, 2016, 02:12 AM »
Its not really feasible to make a combined GB/GBC and GBA cartridge. Here why:

The GBA and GBA SP have a switch inside the cartridge slot that tells the handheld to boot in 'GB/GBC mode'.

This is not a 'pin select' switch, but a physical mechanical switch inside the GBA/GBA SP cartridge slot (Incidentally the GB micro has a solid piece of plastic instead of the switch to prevent GB/GBA games from being inserted)

The original GB/GBC cartridge shell shape presses this switch down, but GBA games dont press it as they have a groove at the side (Take a close look at a GB/GBC and GBA cartridge shell) You can even see the switch if you look into a GBA/GBA SP cartridge slot under a bright light.

In addition GB/GBC and GBA games run on different voltages - GB/GBC cartridges run on 5V, but GBA cartridges run on 3.3V. The switch mentioned above also changes the voltage present on the cartridge slot depending on the inserted cartridge.

I'm sure a GBA Everdrive will support a GB/GBC emulator, but it wont be running on the actual GB/GBC hardware.

Both those reasons should not be a big deal, as stated in an earlier post:

"This would be a fairly simple physical hack. You just need to fill up the notch in the GBA cartridge so it will push the switch of the GBA, putting the GBA into GBC mode. Perhaps something can be used that turns or clicks into place.


Now how to make a cartridge that is at the same time accessible as both a GBA and a GBC cartridge? I have no idea how to do that, because my knowledge of the inner workings of game cartridges is limited. It would probably be about the same as squeezing two different Everdrives into one cartridge, just sharing the cartridge pins.

Perhaps you can use the position of the 'notch-filler' to activate a switch on the board between GBA and GBC modes of the cartridge..."


You can "slide" a notch in place, which would automatically set the cart in a certain mode, including the correct voltage.


The small size of a GBA cart would be your biggest hurdle here.

2
EverDrive N8 / Re: HDMI HidefNES Board Incompatibility
« on: September 22, 2015, 08:05 PM »
GameTechUS asked Krikzz to take a look at the following video: https://www.youtube.com/watch?v=rcy20xhy4H0

3
Off Topic / Re: the next everdrive?
« on: September 16, 2015, 08:22 AM »
Correct. Existing GBA flash carts cannot play GB/GBC games without using an emulator, because the size of the cartridge itself pushes the GBA into GBA mode, locking out GB/GBC functionality.

Unless krikzz figures something out that no one else has been able to (which is certainly possible, but maybe not probable given the current GB(C) flash cart he already had), you will need both to access all 3 types of games.

This would be a fairly simple physical hack. You just need to fill up the notch in the GBA cartridge so it will push the switch of the GBA, putting the GBA into GBC mode. Perhaps something can be used that turns or clicks into place.


Now how to make a cartridge that is at the same time accessible as both a GBA and a GBC cartridge? I have no idea how to do that, because my knowledge of the inner workings of game cartridges is limited. It would probably be about the same as squeezing two different Everdrives into one cartridge, just sharing the cartridge pins.

Perhaps you can use the position of the 'notch-filler' to activate a switch on the board between GBA and GBC modes of the cartridge...

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