Model Years: Mid 1994

Storage: 160MB to 320MB (HDD)

Initial OS: MacOS 7.1.1

Latest OS: MacOS 8.1

Released: May 16 1994

Discontinued: September 16 1995

Processor: 25MHz Motorola 68LC040

RAM Configurations Sold:
- 4MB DRAM Card
- 12MB DRAM Card

Display Specifications:
- 9.5" Greyscale LCD Display (520)
- 640 x 480 display resolution at 84ppi
- 9.5" Colour LCD Display (520c)
- 640 x 480 display resolution at 84ppi

New Features:
- New design
- Trackpad

Model Years: Mid 1994

Storage: 240MB to 500MB (HDD)

Initial OS: MacOS 7.1.1

Latest OS: MacOS 8.1

Released: May 16 1994

Discontinued: August 26 1995

Processor: 33MHz Motorola 68LC040

RAM Configurations Sold:
- 4MB DRAM Card (540c)
- 8MB DRAM Card (540)
- 12MB DRAM Card (540, 540c)

Display Specifications:
- 9.5" Greyscale LCD Display (540)
- 640 x 480 display resolution at 84ppi
- 9.5" Colour LCD Display (540c)
- 640 x 480 display resolution at 84ppi

New Features:
- Faster processor speed

Model Years: Mid 1995

Storage: 500MB (HDD)

Initial OS: MacOS 7.1.1

Latest OS: MacOS 8.1

Released: May 30 1995

Discontinued: April 1 1996

Processor: 33MHz Motorola 68040

RAM Configurations Sold:
- 8MB DRAM Card

Display Specifications:
- 10.4" Colour LCD Display
- 640 x 480 display resolution at 77ppi

New Features:
- Larger display
- New processor