Version Release date Release information 1.0 January 24, 1984 Initial release with System Software 1.0[24] 1.3 May 1984[25] Released with System Software 1.1[26] 1.4 September 1984 Released with Macintosh 512K 1.5 April 1985 Released with System Software 2.0[27] 2.0 January 1988[28] Last release