Installing non volatile ram on GameBoy DMG GBC cartridge. It means no more batteries! No more game saves lost! Install NVRAM on GameBoy carts | CustomRetroStuff.com

GB-NVRAM Installation instructions.

1. Open the cartridge, you may need a  3.8mm security bit. (not included)

2. Remove the battery and dispose according to your local regulations. Do not attempt the next step without removing the battery, fail to do so may lead to personal injury.

3. Identify and remove the original RAM. If you can’t identify the ram chip or memory size, see additional notes.

4. Install the new Non Volatile RAM (NVRAM) chip, it is a direct replacement, check the right  chip position for pin number 1. Use a sharp soldering iron for better results.

5. To install the NVRAM Driver Board, peel off the back of the board, and stick it on the empty battery slot

6. Wire as described in the connection diagram.

7. Close the cartridge and enjoy, you will never need a backup battery again!

ADDITIONAL  NOTES:

* How to identify a RAM chip on a Game Boy cartridge:  it is a 28 pin SOP (SMD) package chip, usually marked as RAM  on the PCB board.

* How to Identify memory size: most games with battery back-up have a 8Kbyte ram chip, only about 10% of those games may have 32Kbyte chips, other configurations may exist on Japanese cartridges.

* For 8 Kbyte Ram: In some boards it is labeled as “64K RAM” it may be confusing because it’s noted in Kilobits. Read the label on top of the chip, it must have a 4 digit code (XX64 or XX65). Ignore other characters, they only indicates manufacturer and date codes. Known chips used by Nintendo are:  

* For 32kByte Ram: In some boards it’s labeled as “256K RAM”, it may be confusing because it’s noted in Kilobits. Read the label on top of the chip, it must have a 5 digit code ending with 256 (XX256). Ignore other characters, they only indicate manufacturer and date codes.

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