Stability improves in PPC Macs with Mac OS 7.6, which drops the "System" moniker as a more trademarkable name was needed in order to license the OS to the growing market of third-party Macintosh clone manufacturers. Mac OS 7.6 required 32-bit-clean ROMs, and so drops support for every Mac with a 68000, as well as the Mac II, Mac IIx, Mac IIcx, and Mac SE/30.