Editing Macintosh SE (section)

== Model Variants ==

The Macintosh SE was produced from 1987 to 1990 in several configurations:

=== Original SE Models (1987-1989) ===
* '''Macintosh SE Dual Floppy''' – Two internal 800 KB floppy drives, no hard drive
* '''Macintosh SE 1/20''' – One 800 KB floppy drive, 20 MB internal SCSI hard drive
* '''Macintosh SE 1/40''' – One 800 KB floppy drive, 40 MB internal SCSI hard drive

Original SE models used the IWM (Integrated Woz Machine) floppy controller chip and were limited to 800 KB double-sided floppy disks.

=== Macintosh SE FDHD (1989-1990) ===
[[File:Apple Mac SE (Little Apple Museum) (8032166773).jpg|thumb|294x294px|Macintosh SE FDHD with "FDHD" marking on front panel]]
In August 1989, Apple introduced the '''Macintosh SE FDHD''' (Floppy Disk High Density), which supported 1.44 MB high-density floppy disks. The FDHD model included:

* '''SWIM chip''' (Super Woz Integrated Machine) replacing the IWM controller
* '''Updated ROM''' (minimum System 6.0.3 required) with SWIM driver support
* '''Sony MPF-75W SuperDrive''' mechanism supporting 1.44 MB MFM-encoded disks
* Backward compatibility with 400 KB and 800 KB Macintosh disks
* '''PC Exchange compatibility''' – ability to read/write MS-DOS formatted disks

The FDHD upgrade was available as a dealer-installed kit (including ROMs, SWIM chip, and drive) for existing SE owners at US$699. In late 1989, Apple renamed the SE FDHD to '''Macintosh SE SuperDrive''', though the hardware remained identical.