Originally Posted by quzar
you don't understand the concept of how roms work. cart systems require all the rom info to be accessable instantaneously, so for cart systems, all cart info is stored in ram (when emulated). This is vastly different from CD systems which rely on temporary storage within their own ram to work, so all you have to do is emulate the ram and you end up with a working emulator with the disc image being accessed a lot (but that won't slow it down because that is how the system was designed to run).