Mac System Software 1.x

Mac System Software 1.0 was released in 1984 for the Macintosh now called the Macintosh 128K or Mac128K. There have been 3 leaked builds of Mac System Software 1.0, one of the builds is on a Twiggy floppy disk which was found alongside a Twiggy Macintosh. The Twiggy floppy disk is a floppy disk that was designed by Apple and was very faulty. There are only 2 releases of Mac System Software 1.x which are 1.0 and 1.1. There is an earlier version of the Finder on the Guided Tour that came with the original Macintosh.