This is my 32KB flash cart that i created. do note its pretty much the same as the insideGadgets 32KB flash card linked below as i followed their guide on youtube and got their advice on the flash chip to use. You will also require a GBxCart from insideGadgets to load a rom onto the cart.
The differances between gerbers are just different soldermasks on the back
The chips needed for the cart are the SST39SF010A, you can source them yourself or here is the aliexpress link for the ones i bought. https://www.aliexpress.com/item/4000346966425.html
This was done as a learning experiance for myself and wanted to share it with you all hope you like the trex!
https://shop.insidegadgets.com/product/gameboy-32kb-flash-cart/
If you would like to support myself or the project buy me a Ko-fi https://ko-fi.com/veund