In practice this results in a 10-20 percent performance improvement. Upgraded video circuitry that results in a lower percentage of CPU time being spent drawing the screen.Better reliability and longer life expectancy (15 years of continuous use) due to the addition of a cooling fan. Improved SCSI support with faster data throughput and a standard 50-pin internal SCSI connector.First Macintosh to support the Apple Desktop Bus (ADB), previously only available on the Apple IIGS, for keyboard and mouse connections.First compact Macintosh that featured an expansion slot.First compact Macintosh with an internal drive bay for a hard disk (originally 20 MB or 40 MB) or a second floppy drive.Its notable new features, compared to its similar predecessor, the Macintosh Plus, were: The 'SE' is an acronym for 'System Expansion'. The Macintosh SE was introduced at the AppleWorld conference in Los Angeles on March 2, 1987.
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