My host does not allow hosting or linking to ROMs (or ISOs). Please do not ask me where to find these files, I’m afraid you’ll have to find them on your own.
Remember that although emulators aren’t illegal, ROMs are illegal. They’re pirated software and unless you own the real game you really shouldn’t download the ROM. Of course, since the systems are very old now and the games no longer available in shops, it probably doesn’t really matter anymore (although let’s not get into legal/moral arguments here!). If you download the ROMs and are caught by any organisation that works against software piracy, on your head be it. That being said, it’s quite unlikely that anyone will know you’re using it. The decision, in the end, is yours, as is the responsibility for any actions taken against you (or any loss/damage) as a result of using ROMs or emulators.