Simple trick for replacing Game Boy cart batteries while retaining game saves

[Adr990] wants to make sure his Game Boy game saves aren’t lost to aging batteries. They’re stored in SRAM with a small coin cell inside the cartridge to keep the memory energized when the game is not being played. But if you pull out the battery in order to replace it the data will be lost in the process. It turns out that you can hot-swap the battery without too much effort. As shown in the video after the break, he disassembled the case of the cartridge, then replaced the battery while the Game Boy is switched on. The edge connector feeds power which will keep the SRAM active while the backup battery is removed. We’re sure this could be done with a bench supply as well, but you’ll need to do your own testing before risking those prized game saves.

The other option is to backup your SRAM before replacing the batteries. We’ve seen an AVR-based cartridge dumper, and also one that uses an Arduino. Both should be able to read and write SRAM data. [Read more...]

Adding a MIDI input to a Game Boy

[Sprite_tm] is back again, and his work never fails to impress. His latest project is a Game Boy Advance MIDI synth that takes MIDI data from a keyboard or sequencer and maps that to Game Boy sound channels.

Because he seems to never do anything the normal way, [Sprite_tm] decided to run the Game Boy without a cartridge. We’ve seen this before; the GBA boots into the synth software over the link cable with multibooting.

[Read more...]

Going a long way for Game Boy Advanced video out

Here’s an intense hack that lets [Matt Evans] play Game Boy Advanced on a larger LCD monitor. He didn’t take the easy way out during any step of the process.

He’s using an FPGA to translate the LCD signals from the GBA hardware into a 1280×960 picture that is then pushed to the large monitor. But did he use an FPGA development board? No, instead he picked up an old PCI card at a surplus store because it had a Xilinx Virtex-E FPGA. So the first thing he had to do there was to remove unneeded components and figure out how to make the connections to reprogram that chip.

So next you’d grab a working monitor and hook it up to the FPGA signal, right? Wrong, [Matt] had a slightly borked monitor, getting rid of the LVDS section and wiring up his own connections to push the RGB signals through in parallel.

Yeah, that’s a lot of work. But as you can see in the clip after the break, it works like a charm. If you’re looking for some other gnarly video-out hacks, check out this one that lets you play Game Boy on an oscilloscope.

[Read more...]

Game Boy communicates directly with an SD card

[kgsws] just finished his Game Boy upgrade that allows him to load games from an SD card. Loading a game off an SD card has been done before, but [kgsws] decided to not to use a cartridge-based device. In the end, he threw out all the stops and finished his project by having the Game Boy access an SD card directly.

[kgsws] his project trying to figure out how to put some GPIO pins on a game cartridge, but figured that this would take too much hardware. After looking at the specs of the link port, he realized that it was the wrong polarity. Not to be deterred, [kgsws] realized that there was something like a general-purpose I/O on the Game Boy – the joypad input.

[Read more...]

AVR Gameboy Dumper

[Kevan] has been hard at work latley developing a Gameboy cart dumper, and while there are a few loose ends to tie up, the device is functioning fine to build up his collection. Running an AVR (mega 16?) and a FTDI chip for the usb connection, the device reads the game’s ROM and SRAM, and can also write the SRAM if you want to load your save games on to the real cart.

On the pc side of things, the device is communicated with using a generic HID protocol and can hit speeds from 16Kbps (currently) to around 64Kbps (soon). A python script currently handles the data stream, but for the rest of us there is a GUI version in the works for both *x and windows.

Also in the works is a redesigned PCB. There were a couple issues and you can see the jumpers, and though we think it adds a little character, it would be good to have fixed in the future.

Solar-powered GameBoy Color never runs out of juice

solar_gbc

Instructables user [Andrew] was given a free, but damaged GameBoy color by a friend. The friend’s dog had done quite a number on the outside of the handheld, but it was definitely usable.  After replacing some of the outer shell, [Andrew] decided that he would try tweaking the GameBoy to utilize a solar cell in order to keep the batteries topped off.

He bought a solar garden light for $5 and disassembled it, being careful not to damage the heavily-glued solar panel in the process. The GameBoy was pulled apart next, and the solar panel was soldered to the handheld’s battery leads. Once the wires were properly routed through the case, he reassembled the handheld and picked up a pair of rechargeable AA batteries to test things out.

[Andrew] tells us that the solar panel works nicely, and that simply setting it out face-down keeps his batteries charged and ready to go.

Stick around for a quick video demo of his solar-powered GameBoy.

[Read more...]

Gameboy ROM backups using an Arduino

gameboy_cart_reader

[Alex] collects retro gaming consoles. One day while playing a SNES title, his save games got wiped when he powered off the system. It turned out that the battery inside the game cartridge got disconnected somehow, and it got him thinking. He decided he wanted to find a way to back up his save games from the cartridges for safe keeping.

While cart readers exist, he says that they are hard to find nowadays, so he decided to construct his own using an Arduino. SNES cartridges are relatively complex, so he opted to focus on Gameboy cartridges for the time being. Before attempting to back up save games, he first chose to learn how to communicate with the cartridges in general, by reading the ROM.

He breaks the cartridges down in detail, discussing how they are constructed as well as how they can be addressed and read using the Arduino. He was ultimately successful, and offers up code as well as schematics on his site for any of you interested in doing the same. We imagine that save game reading (and perhaps editing) will likely happen in the near future.

Check out the video below to see his cart reader in action.

[Read more...]