I know people have been working on GBA stuff - found here:

http://www.gbadev.org/

http://forum.gbadev.org/

has anyone done any original gameboy stuff?

what would you need to do that?

Original gameboy stuff would be similar to programming original NES stuff (except for Z80 instead of a 6502).
Basically, anybody that has programmed assembly for the TI graphing calculators would be well equipped to do gameboy. There is a huge resource out there for TI programming. I'm sure some of the graphics instructions or memory instructions may be different, but the major stuff for the processor should be identical ( much like C64 and NES are similar to an extent ).

GBA (and later) is nice, though because it's compiled from C++. High level languages are SO easy by comparison to writing in assembly.

I'm not sure how you'd get the game onto the cart when you are done. I know I'm no good at surface mount soldering.

I've got a dev cart (probe?) at home that I believe is setup so that you can upload/run using a cable to connect a computer to the gameboy. However I think in my case, its a GBC version. I've honesty never tried.

Al

I knew there was one started, I believe it was missing a few levels and music

You could use a flash cartridge for now, just to test out the game on actual hardware as you are developing it to make sure it's working properly. Of course you couldn't use flash carts to mass produce them (to sell), though at least you could use flash carts as a dev tool to test your game.

LSDJ comes to mind...

I've done a bit of gameboy dev years ago, quite fun at the time. There's a C compiler with the GBDK libraries I think that makes it quite easy to get up and running. I wrote the original Chunkout using the C compiler (the difference between the GBC and the GB is really just some palette stuff).

A flash cart will come in handy for hardware testing, emulators will work for most testing though.

Cool. Didn't realize there was a C compiler for GB. I wonder why that never came about for the NES? Is the instruction set for the 6502 that much worse to deal with compared to the Z80? Or does the Z80 just have a larger programmer-base?

I believe (not 100% at off the top of my head) that the Z80 had more registers that make C a bit more functional, also there just appears to be a bigger community for the Gameboy working on the libraries. There is a NES C compiler, it just doesn't really have the same level of library support to make anything useful.

another question. If somebody does to original game boy, can it be colored? and will it work on a super game boy?