Macintosh Plus

The Macintosh Plus is the third Macintosh model in the Macintosh computer line, released on January 16, 1986. It is one of the earliest Macs released and was a major success, remaining on the market for nearly 5 years.

Introduction
Rumors of the development of the Macintosh Plus circulated as early as December 1985.

Memory and connectivity
The Mac Plus came with 1MB of RAM and a new SCSI port. The previous serial ports were replaced with  versions. The Plus was also expandible up to 4MB.

Other features
With the addition of the SCSI port, the Mac Plus was the first model to support the Hard Disk 20SC, a much faster (and expensive) version of the Hard Disk 20, which connected through the floppy port.

Marketing
Like earlier models, the Macintosh Plus included a set of audio cassettes as a guided tour for new users. However, it was the first model to include an interactive demo that had been scripted with a customized version of MacroMind VideoWorks, a predecessor of Macromedia Director.