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G1 Extension Board
Features

• Holds up to 2 FlashROM ICs (up to 2 MB each)
• ROM selection from SH4 software (added G1 HW register)
• Reset ROM selection configured via jumper
• Power LED on/off control from SH4 software (added G1 HW register)
• Fan TGP emulator
• Easy to install and fits perfectly :)