Is there any way to dump/backup a SegaCD RAM cart?

Discussion in 'Dumping and Backing Up Your Games and Prototypes' started by Cyber Akuma, Aug 25, 2018.

  1. Tommygun

    Tommygun Active Member

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    You are incorrect about the size.
    It is a 1Mbit cartridge, The first file I uploaded was the entire cartridge.
    The second file was the cartridge, plus the empty space that was left in the megadisk's RAM, which is 16Mbits.
    2018-10-02 (7).png

    My cartridge may just be empty, if there is no data in the files.

    **EDIT**

    I got a Sega CD today, and it confirmed my fear. The ram cart wasn't just empty, it wasn't even formatted!

    It took the format well, and I copied-over a few saved games, that were on the system's memory. I will dump it again a few times, so comparisons can be made between when the cart is empty, and when it has a game save on it.
     
    Last edited: Oct 5, 2018
  2. abveost

    abveost Peppy Member

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    Nah. Spot on about addressable memory size. You're confusing that with cart size. The question is where is that 128k cart located in that 16MB of space. If it's a $0 then you dumped it when you used your cart dumper. If it's at $4000000 like the source you cited seems to say then your dump of $0-$200000 missed it by a mile.
    You can check by comparing the first 16k of your first dump with the first 16k of the dump after you formatted. If they're the same then it's not at $0.
     
  3. Cyber Akuma

    Cyber Akuma Rising Member

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    I looked at the two dumps with a hex editor and I don't think it actually dumped the cart's contents. Going by the virtual RAM cartridge file that multiple SegaCD emulators produce, they all had the phrase "SEGA_CD_ROM RAM_CARTRIDGE___" at the end. Nothing like this was in either of the two dumps, and there were patterns of trash data that do not appear in the emulator-created RAM cart files.
     
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  4. Tommygun

    Tommygun Active Member

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    I can't speak to memory addresses, as I don't have much knowledge of programming.

    I can now use the transfer cable, as I have the Sega CD unit.

    I will attempt to dump the cart in every way I can, and give you a description of what should be there, but hex editing, isn't something I have knowledge of, as much as, I know what hex is, as a number system, and how to convert back-and-forth to binary. I also have a basic knowledge of logic gates, Boolean logic, and logic tables.
     
  5. abveost

    abveost Peppy Member

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    If you post the dumps I can easily compare them. If they don't have the save data I'll look into it further. If the cart is in the place it' said to be a byte or so of hex editing to the dump program would let you dump that.
     

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