SummerCart64 Flash Cartridge 4TG – 64DD Emulation & SD Card Support - Nintendo 64

Expand your original Nintendo 64 with the SummerCart64 4TG, a feature-rich N64 flash cartridge with fast microSD loading, automatic save handling, 64DD emulation and support for additional classic systems through compatible emulators.

SummerCart64 connects directly to the Nintendo 64 cartridge slot and allows compatible N64 software, homebrew, ROM hacks and 64DD disk images to be accessed from a microSD card using N64FlashcartMenu. No soldering or internal console modification is required.

This standard version uses a Lattice MachXO2-7000HC 4TG speed-grade FPGA, providing an affordable entry point into the SummerCart64 platform while retaining the extensive software, storage and homebrew functionality associated with the design.

N64FlashcartMenu provides a clean console-based interface for browsing compatible software, managing saves, viewing artwork, accessing favourites and recently played titles, adjusting the real-time clock and launching supported homebrew.

SummerCart64 is not limited to Nintendo 64 software. Compatible emulator support allows Game Boy, Game Boy Color, NES and Super Nintendo software to be launched through the Nintendo 64 from the same microSD card.

Current N64FlashcartMenu support also extends to Sega Master System and Game Gear through compatible emulator software, further expanding the range of classic systems accessible through the cartridge.

The SummerCart64 hardware includes 64MiB of SDRAM and 16MiB of QSPI flash memory, providing enough working space for every known retail Nintendo 64 cartridge image as well as larger compatible homebrew projects.

Its high-speed microSD interface provides transfer rates of up to approximately 23.8MiB/s, allowing even large Nintendo 64 software images to load quickly. SummerCart64 supports microSD cards up to 2TB, providing substantial removable storage for compatible N64 software, homebrew, saves, emulator ROMs and 64DD disk images.

Automatic save handling supports common Nintendo 64 cartridge save types including EEPROM, SRAM and FlashRAM. Save data is automatically written back to the microSD card without requiring the traditional reset-before-power-off routine associated with some older N64 flash cartridges.

A built-in battery-backed real-time clock provides RTC functionality for compatible software and homebrew, with a replaceable CR2032 battery retaining the clock while the console is switched off.

SummerCart64 also provides hardware-level Nintendo 64DD emulation, allowing compatible raw 64DD disk images to be accessed from microSD or USB without requiring the original 64DD hardware.

Compatible standalone 64DD software and cartridge-plus-disk titles can be used when the appropriate 64DD IPL files and any original console accessories required by the software are available.

Automatic PAL and NTSC CIC handling allows the same SummerCart64 cartridge to operate across compatible European, North American and Japanese Nintendo 64 consoles without manually changing a region switch or physical CIC chip.

USB-C connectivity provides another high-speed interface with transfer rates of up to approximately 23.8MiB/s and also supports compatible Nintendo 64 homebrew development and debugging functions.

For developers, SummerCart64 supports tools including UNFLoader and the IS-Viewer 64 debug interface, making it considerably more capable than a basic Nintendo 64 game-loading cartridge.

For Nintendo 64 owners looking for an affordable N64 flash cartridge with fast microSD loading, automatic saves, Game Boy, Game Boy Color, NES and SNES emulation, multi-region support and 64DD functionality, the SummerCart64 4TG provides a comprehensive way to expand original N64 hardware.

Product Type: Nintendo 64 flash cartridge
Product: SummerCart64 4TG
Version: Standard 4TG
Compatible Console: Nintendo 64
Cartridge Interface: Nintendo 64 cartridge slot
FPGA: Lattice MachXO2-7000HC
FPGA Speed Grade: 4TG / Speed Grade -4
Internal SDRAM: 64MiB
Internal QSPI Flash: 16MiB
Reserved QSPI Flash: Approximately 2MiB
Usable Extended Flash: Approximately 14MiB
Maximum Combined ROM Space: Approximately 78MiB
General Buffer: 8KiB FPGA buffer
Storage Interface: microSD
Maximum microSD Capacity: Up to 2TB
microSD Peak Transfer Rate: Approximately 23.8MiB/s
USB Connection: USB Type-C
USB Peak Transfer Rate: Approximately 23.8MiB/s
Menu Support: N64FlashcartMenu
Nintendo 64 Software: Supported
Nintendo 64 Homebrew: Supported
Game Boy Emulation: Supported through compatible emulator software
Game Boy Color Emulation: Supported through compatible emulator software
NES Emulation: Supported through compatible emulator software
SNES Emulation: Supported through compatible emulator software
Master System Emulation: Supported through compatible emulator software
Game Gear Emulation: Supported through compatible emulator software
64DD Emulation: Hardware-level Nintendo 64DD emulation
64DD Disk Access: microSD or USB
64DD Cartridge + Disk Support: Supported where compatible
Region Handling: Automatic PAL / NTSC switching
CIC System: UltraCIC_C emulation
EEPROM 4Kbit Saves: Supported
EEPROM 16Kbit Saves: Supported
SRAM Saves: Supported
FlashRAM Saves: Supported
Automatic Save Write-Back: Yes
Real-Time Clock: Yes
RTC Backup Battery: CR2032
UNFLoader Support: Yes
IS-Viewer 64 Support: Yes
Status LED: Yes
Programmable Button: Yes
Open-Source Hardware: Yes
Console Modification Required: No
Soldering Required: No
Installation: Plug & play cartridge installation

Nintendo 64

PAL Nintendo 64: Supported

NTSC-U Nintendo 64: Supported

NTSC-J Nintendo 64: Supported

SummerCart64 automatically handles PAL and NTSC CIC region switching, allowing the same cartridge to operate across compatible Nintendo 64 regions.

Nintendo 64 Software

Retail Nintendo 64 Software: Supported

Nintendo 64 Homebrew: Supported

Compatible ROM Hacks & Fan Translations: Supported

EEPROM Save Software: Supported

SRAM Save Software: Supported

FlashRAM Save Software: Supported

Games that use a physical Controller Pak for save data continue to require a compatible Controller Pak for normal in-game saving.

Nintendo 64DD

Nintendo 64DD Disk Images: Supported

64DD Cartridge + Disk Software: Supported where compatible

64DD IPL Booting: Supported

Compatible IPL files and any hardware originally required by the software, including an Expansion Pak where applicable, remain necessary.

Nintendo Game Boy

Game Boy ROMs: Supported through compatible N64FlashcartMenu emulator software

Nintendo Game Boy Color

Game Boy Color ROMs: Supported through compatible N64FlashcartMenu emulator software

Nintendo Entertainment System

NES / Famicom ROMs: Supported through compatible N64FlashcartMenu emulator software

Super Nintendo Entertainment System

SNES / Super Famicom ROMs: Supported through compatible N64FlashcartMenu emulator software

Emulator performance and compatibility vary according to the emulator, system and individual software title.

Development & Homebrew

N64FlashcartMenu: Supported

UNFLoader: Supported

IS-Viewer 64 Debug Interface: Supported

USB-C Development & Debugging: Supported

4TG Standard Version: This version uses the Lattice MachXO2-7000HC 4TG speed-grade FPGA. Buyers specifically looking for the FPGA speed grade specified by the original SummerCart64 reference design should choose the 6TG version.

microSD Storage: SummerCart64 loads compatible software and save data from a microSD card. An 8GB microSD card is included.

Expansion Pak Requirements Remain: SummerCart64 does not replace the Nintendo 64 Expansion Pak. Software that originally requires the Expansion Pak will still require one.

Controller Pak Saves: Games that originally save to a Controller Pak still require a compatible Controller Pak for normal in-game saving. Automatic SummerCart64 save write-back applies to supported cartridge-based EEPROM, SRAM and FlashRAM saves.

64DD Setup: Compatible 64DD disk images and the appropriate 64DD IPL files are required when using 64DD functionality.

Emulator Compatibility Varies: Game Boy, Game Boy Color, NES, SNES and other systems run through compatible N64 emulator software. Performance and compatibility vary between individual titles.

1 × SummerCart64 4TG Flash Cartridge
1 × 8GB microSD Card

This SummerCart64 4TG Flash Cartridge is covered by a 12-month limited Retrolize warranty against manufacturing defects and hardware faults arising during normal use.

The warranty does not cover accidental damage, liquid damage, damaged cartridge connectors, damaged microSD or USB-C ports, excessive force, unauthorised hardware modification or faults caused by incompatible equipment.

Corrupted microSD cards, damaged files, incompatible software, incorrectly configured menu files, incorrect 64DD IPL files, individual emulator or homebrew incompatibilities or issues caused by third-party software are not considered hardware faults.

Software requiring original Nintendo 64 accessories such as an Expansion Pak or Controller Pak will continue to require that hardware where applicable. Failure of software caused by a missing required accessory is not considered a fault with SummerCart64.

Emulator compatibility and performance can vary between Game Boy, Game Boy Color, NES, SNES, Master System, Game Gear and individual software titles. Emulator-specific limitations are not considered hardware faults.

Normal depletion of the replaceable CR2032 real-time-clock battery through age and use is not considered a manufacturing defect.

The Retrolize warranty is provided in addition to your statutory consumer rights.

Warranty claims remain subject to the full Retrolize warranty terms.