Macintosh SE 1/20 - aka Mac FDHD

The SE was the first compact Mac with an expansion slot and internal harddrive. Originally the SE could use only Single Density (SD) (400 KB) and Double Density (DD) (800 KB) formatted floppy disks.

In August 1989, Apple introduced the Macintosh SE FDHD with the new SuperDrive, a floppy disk drive that could handle 1.4 MB High Density (HD) floppy disks. Not only did this provide 1.4 MB capacity, but also the ability to read and write 3.5" DOS disks using special software. HD floppies would become the de-facto standard on both the Macintosh and PC computers from then on.

• SE 1/20 aka FDHD introduced 1989.08.01
  discontinued 1990.10.15
• requires System 4.1 (System 4.0 and Finder 5.4) to 7.5.5
• CPU: 8 MHz 68000
• performance: 1.0 (relative to SE)
• ROM: 256 KB
• RAM: 1 MB, expandable 4 MB using pairs of 256 KB or
  1 MB 150ns 30-pin SIMMs (will not work with two-chip 1 MB SIMMs)
• configuration: one floppy plus 20 MB hard drive
• 9" b&w screen, 512 x 342 pixels
• ADB: 2 ports for keyboard and mouse
• serial: 2 DIN-8 RS-422 ports on back of computer
• SCSI: 1 DB-25 connector on back of computer
• size (HxWxD): 13.6" x 9.6" x 10.9"
• single SE PDS slot

Related Links : wikipedia.org - lowendmac.com

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