you would like to know how GBA ROMs are made?!
Connect GBA Cartridge to PC
You have to have a way to connect gameboy cartridge to the PC. For
that you can you Flash Advance Linker or FA Linker Xtreme. Regular
linker connects to Printer port when Xtreme can be connected to
both printer port or USB.
Save game data on PC as *.GBA file
When you have FA Linker connected you can use Flash Advance Writer,
Little Writer or Flash Xtreme writer software to save the game from
the cartridge on to your PC Hard Drive. It will be saved as .GBA
file. Most roms are 4MB or 8MB
(1 Mega Byte on PC = 8 Mega Bits on Cartridge)
Play backuped games on PC, GB Advance or GBA SP
When you have backuped the game on the PC you can Play it with one
of the Gameboy Emulators or you can send it a ReWritable Flash Advance
card and play it on another Gameboy. Because Flash Advance Cards
are bigger than
regular GBA Cartridges you can make compilation of say 8 of your
favorite games and write them to one 256M FA Card.
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In short - this is how most of the gameboy advance roms that you
can download from the internet are made. As you can see - the main
purpose of roms (and FA Linker) is not to play then on PC's using
Emulators, but to use them as backups of your original games. Of
course if you have made a backup of your game you can play it PC
if you like..
Flash Cards work - Tutorial with screenshots