Famicom Dumper/Programmer

You can use it to:

Dump cartridges, so you can play copy of your cartridge on emulator

Read/write battery backed saves, so you can continue your saved game on emulator/console

Write special cartridges like COOLGIRL

Rewrite ultracheap chinese COOLBOY cartridges. Soldering required but it's very simple.

Test your cartridges

Some reverse engineering

Anything else that requires Famicom bus simulation

You need:

ATMEGA64

FT232RL

60-pin edge socket

Printed circuit board, you can order one using files it "board" or "board2" folders.

Some capacitors

Maybe some leds

How to build it

You need to flash ATMEGA64 microcontroll using any AVR programmer. It's recommended to program bootloader first, so you can flash/update firmware via USB. I'm using bootloader by Martin Thomas, you can use already configured one in bootloader folder. There are fuses for it:

LFUSE = E4

HFUSE = DC

EFUSE = FF

You can program it using command like "make program PROGRAMMER_TYPE=avrisp2 PROGRAMMER_PORT=usb" from bootloader folder. Don't forget to replace avrisp2 and usb with you programmer type and port.

Connect device to USB and PC will detect it as virtual serial port. First 8 seconds after power up bootloader is active (all leds are on), so you can program main firmware.

You can use command "make program PROGRAMMER_PORT=COM10" to program main firmware. Replace COM10 with port assigned to your dumper (you can use Windows device manager to see it).

Also it's recommended to reprogram FT232 chip using FT_PROG util to change device name to "Famicom Dumper/Programmer", so it can be detected automatically by software.

That's all! You can use it now.

How to use it

Now you need PC-side client to use it: https://github.com/ClusterM/famicom-dumper-client

project by ClusterM

page of the project https://github.com/ClusterM/famicom-dumper