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Sure! Does it use an Intel Flash IC? If the protocol/flash block size is the same as just about every other generic cart out there It should already be supported. If you have a few carts at your disposal, it might be easier for me to send you a Joey?

The header is integrated into the ROM, its there on the real cart as well as downloadable ROM's.

Tin oxidises rapidly, the oxide is an insulator which leaves you with intermittent contact. Tin is also soft and will alloy &/ transfer with the copper/gold  fingers inside the gameboy depositing the same oxide on the gameboy's contacts, which gives you poor contact with other carts you use thereafter.

If you're super keen to do this yourself, and i get it, I build things for the challenge too, not so much cost effectiveness - send me an email and I'll tell you all you need to know. Or drop by #GBDev on Efnet, lots of bright friendly guys willing to help you out.

In response to this: 'And I'm pretty sure about home made cards being waaay cheaper than any GB flashcart product' I disagree. As Jazz said, 5v flash IC's of the size and vintage you want are not in production, they will either be Old stock, recycled or they will use 3.3v products which presents a whole lot of issues in itself. Plus the MBC you'll need to re-purpose from another cart, or get stuck into CPLD/FPGA design.

You'll need to get PCB's made up, hot air re-flow station if you want to work reliably with SMD parts, Flash programmers, SMD ZIF sockets, Logic analysers (very helpfull!), JTAG interface + software for the CPLD/FPGA.

Not to scare you off, you can make one yourself but it will cost you a lot more than just buying an EMS/Smartboy/BV etc.... If you were to produce a batch of say 5000, then yes, it would be cheaper per piece - with a huge outlay.

Hey aZu, I wasn't aware of my cart glitching out like that. Can you PM me with the specifics? If it's a bad cart I'll send you another.

Also, I may have found a cheaper source of flash carts. I've got some inbound for testing. If all goes well I'll have 1, 2 & 4 mbyte carts with 128k + 256k SRAM for half the price of existing BennVenn carts.

Just an update, current firmware version 3.10 is out. Support for a whole heap of flash carts, GBA carts, GBcamera real time image streaming!

Adding Bung carts and hopefully Smartboy carts in the coming days/weeks.

Just waiting on the cart connectors, should be in today. When they arrive I'll update the stock on the page. Thanks!

Hey Eric,

Sorry, For some reason it wasn't included in that last build. Download the first link on the page, it's in there. I'll fix it up asap.