System 0.85

System 0.85, produced in 1983, was the system provided on the original Macintosh Guided Tour disk. It was released in 1983 with the original "Finder" labeled as 1.0 (but older than the Finder 1.0 on the 0.97 boot disk); it booted directly into the Guided Tour software. This system only runs on the original Macintosh computer with 128k RAM, and pre-dates the retail version released with the Macintosh 128k.

The original Tour disk included the welcome screen, usage information, the Finder, the Amazing game, and Mousing Around.