SC64 - an open source Nintendo 64 flashcart

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Features

• 64 MiB SDRAM memory for game and save data
• 16 MiB FLASH memory for bootloader and extended game data
• 8 kiB on-chip buffer for general use
• ~23.8 MiB/s peak transfer rate USB interface for data upload/download and debug functionality
• ~23.8 MiB/s peak transfer rate SD card interface
• EEPROM, SRAM and FlashRAM save types with automatic writeback to SD card
• Battery backed real time clock (RTC)
• Status LED and button for general use
• 64DD add-on emulation
• IS-Viewer 64 debug interface
• N64 bootloader with support for IPL3 registers spoofing and loading menu from SD card
• Enhanced UltraCIC_C emulation with automatic region switching and programmable seed/checksum values
• PC app for communicating with flashcart (game/save data upload/download, feature enable control and debug terminal)
• UNFLoader support
• Initial programming via UART header or dedicated JTAG/SWD interfaces
• Software and firmware updatable via USB interface
• 3D printable plastic shell

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Documentation

• Memory map
• USB commands
• N64 commands
• Config options
• FW/SW building
• Manufacturing guidelines

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Help / Q&A

For any questions related to this project, please use Discussions tab in GitHub repository. Do not use my e-mail for these questions, as I want to have a centralized knowledge base accessible for everyone interested in this project.

I'm also active at N64brew Discord server as korgeaux#5558 but keep in mind that Discussions tab is a preferred option.

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High-level flashcart block diagram

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Finished example

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Acknowledgement

This project wouldn't be possible without these contributions:

• 64drive orders being on permanent hold long before creating this repository.
• EverDrive-64 X7 being disappointment for homebrew development (slow USB upload, unjustified price and overcomplicated SD card access).
• Jan Goldacker (@jago85) and his projects:
  • Brutzelkarte providing solid base for starting this project and sparking hope for true open source N64 flashcarts.
  • UltraCIC_C reimplementation for easy integration in modern microcontrollers. Thanks also goes to everyone involved in N64 CIC reverse engineering.
• N64brew Discord server community being very helpful during flashcart development.
• FatFs FAT32/exFAT library being easiest to integrate in embedded environment.
• Yakumono's (@LuigiBlood) extensive 64DD documentation and its implementation in various emulators.
• Libdragon open source N64 SDK project and its developers.