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Thread: Neo Geo CD needing original bios

  1. #1
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    Neo Geo CD needing original bios

    Hey All,

    I'm trying to revert my neo geo cd back to stock i replaced the original bios with a unibios a year or so ago but cannot find the original bios chip. Reason i need or rather i guess want to revert it so i can utilize the neo geo cd sd loader which currently doesn't work with the unibios. Now the bios i've found to flash a m27c4002 which i've used for the mv1c in the past didn't work i just received a black screen. tried neocd bin as well as a neocdz bin. not sure if they needed to be byte swapped and i'm a novice in this field any help would be appreciated. I also have a 27c1024 eprom as well if need be. but if possible could someone point me to the right file or right direction i'd appreciate it. and its the neo geo cd top loader model.

  2. #2
    JammaNationX
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    You need a 27C4001 not 4002

  3. #3
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    oh wow really? only the 4001? no other chips. but thanks! i'll look into that. appreciate it! also i'm not the greatest with these would be like the ST M27C4001-80XF1 DIP-32 EPROM or M27C4001-15FI EPROM
    Last edited by Igbeserk; 09-04-2020 at 04:46 AM.

  4. #4
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    Think i got it. my dumb self for not looking first. Peeled back the sticker off of the unibios and it shows a 27c4100. the 4001 is a 32 pin chip which wouldn't work since it would need to be 40. just ordered 2 of the 4100's. thanks again!

  5. #5
    JammaNationX
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    Ya 4100, not sure why it autocorrected to 4001.

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