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Man, we gotta stop doing this kind of stuff after page 3...

No carts?? You're making my visits to the grocery pretty complicated...

Ah! (De)compression! That's something that I don't think the GB can do comfortably, really. The NGPC apparently has 16-bit CPU. Then there's the (perhaps small) problem of the user turning off the power in the wrong moment while writing to bank 0 and locking yourself out of the the bootloader, so you have to fix it over USB. On the other hand, the compression method might just work. I'll have to do some experiments.

My original idea was to only overwrite bank 0, and store the rest of the ROM banks in higher ROM banks, and patch the ROM switch routine in each ROM to go to those higher banks. Painful to get right, but will work really fast once it's in place and works.

Was ist das? Eine page aus Herr Professor Peter Lewis Swim?!

Actually, no that wouldn't work.

The problem is this. The GB CPU can only address 64 kilobytes of memory. So to access more than that, you use so called bank switching. There are two ROM memory areas areas available from a regular GB cartridge. One area is a fixed area which points to the bottom 16 kilobytes of the ROM chip. (Bank 0) Then there's a switchable area which can address one variable 16 kB area at a time.

The problem with this cart, and "jose"carts as well is that they can't switch out bank 0. For that reason hey can't do multiple ROMs, since each program is dependent on having it's own "bank 0".

Now there's a way around this. Since this is a flash cartridge, and the Gameboy can write to the flash memory, you could use a software method where a piece of code on the Gameboy writes a new bank 0 for every newly loaded ROM. Then the ROM also needs the rest of its banks, and there are different methods of solving that. But either way it'll be hackish, and there's the risk of temporary failure if he cartridge loses power during this operation. In that case, it would need to be reprogrammed using USB.

Normal LittleFM operation is planned to be supported and poses no problem, however.

That's indeed a good placement for a jack. I've done a couple P******* mods where I've glued the jack to the back of the battery compartment with super glue. Has worked for me.

Now tell me, what's the capacitance and voltage rating on those caps?

Don't have many moniez, don't have a NES and don't know 6502 asm, so this thing is not for me. Cool nevertheless, of course!

Another thing ou might want to look into is allowing code download to RAM via sysex messages. For best use, it would be a good idea to let the code in RAM hook interrupts as well. (Not sure about how you best do that with 6502...)