Previous (literally the antonym of next) is an open source emulator of the proprietary 68k-based NeXT computer system family, aiming at emulating the original 68030-based NeXT Computer and the 68040-based NeXTstation and NeXTcube computers.The emulator was created to deploy the early versions of the NeXTSTEP operating systems (0.8 to 3.0), original NeXT software (e.g.