I have a Macintosh, and everything about it is original except for the upgraded RAM. Does anyone know where I can find 128k of RAM for this Mac? Better if Apple-branded but it doesn't have to be if the Apple-branded one is too much money. It was upgraded to 512k, but IDK if that is two 256k or 4 128k... can someone tell me? If it's 4 128k then can I just remove all but one of the RAM modules?