compatibility with Kega Fusion 128KB RAM Cart

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What steps will reproduce the problem?
1. Saving a game to the ram in genplus-gx (i.e. "Snatcher")
2. Run said game in Kega Fusion 3.64 (i.e. "Snatcher")
3. Select saved RAM Cart: File->Load RAM Cart->cart.brm->Cartridge
4. Select CD RAM Cart in game

What is the expected output? What do you see instead?
It should let me continue my saved game in Kega Fusion, but instead I have to 
format the RAM cart, losing my saved data.

Original issue reported on code.google.com by superKal...@gmail.com on 20 Jul 2013 at 2:05

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After checking Fusion RAM Cart files, it appears Fusion doesn't support 
Genesis Plus GX RAM Cart files because Fusion only supports RAM Cart up to 
128KB , while Genesis Plus GX emulates a 512KB RAM Cart by default, which is 
the theoretical max. size for this backup device.

I guess i could add configurable RAM Cart size to allow compatibility with 
Fusion but it will add compatibility issue within Genesis Plus GX itself when 
using different RAM Cart size, with the risk of formatting existing RAM files, 
which is quite stupid, especially when it's easier for you to just copy the 
game saves to built-in RAM then use the saved file (ex: scd_U.brm) in Fusion.

Original comment by ekeeke31@gmail.com on 21 Jul 2013 at 8:47

• Changed title: compatibility with Kega Fusion 128KB RAM Cart
• Added labels: Type-Enhancement, Priority-Low, Usability