In the late 1980s, laptop computers were starting to gain popularity as their performance was improving and their size was decreasing. But Apple's first entry into the market wasn't exactly a graceful one.
Sources:
Toshiba J3100 photo: https://commons.wikimedia.org/wiki/File:Toshiba_J-3100GT.jpg
Data General One photo: https://twitter.com/mwichary/status/762023368589574144
Numeric keypad photo: https://estatesales.org/online-auctions/1989-apple-macintosh-portable-computer-61578585
IBM 5155 luggable PC photo: https://commons.wikimedia.org/wiki/File:IBM_5155_(1).jpg
Original battery photo: https://estatesales.org/online-auctions/1989-apple-macintosh-portable-computer-61578585
Rebuilt battery photo: https://www.worthpoint.com/worthopedia/rebuilt-apple-macintosh-m5137-1901037165
Mac Portable motherboard photo: https://www.theregister.com/Print/2010/11/09/macintosh_portable
"The Macintosh Portable," Macworld, November 1989.
"ClearPoint Ships Memory Upgrades for Mac Portable," InfoWorld, August 27, 1990.
Mac Portable in-box battery charger photo: https://www.ebay.com/itm/363685845507?hash=item54ad5d9a03:g:iXIAAOSwyDth3KZh
"Mac to Go," MacUser, November 1989.
"Apple Delivers a True Mac With Its Pricey Portable," InfoWorld, October 23, 1989.
Computerworld, August 21, 1989.
Backlit Mac Portable photo: https://www.retropaq.com/macintosh-portable/
Mac Portable introduction video: https://www.youtube.com/watch?v=ZzlQdWKmPuE
Compaq LTE 286 photo: https://en.wikipedia.org/wiki/File:Laptop_Compaq.JPG
"Macintosh PowerBooks 100, 140, and 170," Macworld, December 1991.
An interesting read about the development of the Mac Portable: https://www.retropaq.com/macintosh-portable
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