Building a flashcart

[5233]

I want to build a wonderswan/wonderswan color flashcart but someone tells me it would be too convoluted. However, I have a tendency to doubt his advice because: 1) He says GBC emulators are too much for the DS to handle, which sounds like a joke, and 2) There is already a very very scarcely produced Wonderswan flashcart in asia called the WonderMagic Color, though it ran through a printer port rather than USB.

I hear the WS series uses a mapper similar to the Gameboy and NES and they have flashcarts available so I don't know if its true that its impossible to make a WSC flashcart. I just want some advice as I may help make one available in limited numbers in the future, possibly with USB. Thanks!

[Dant]

Hate to break it to you, but he is right, unless you already have some experience in hardware engineering or know you're way around an FPGA you would be very hard-pressed to make a flash cart for anything.