This Does Not Compute | PowerBook 550c: Restoring Apple's Rarest Laptop @ThisDoesNotCompute | Uploaded March 2020 | Updated October 2024, 2 days ago.
Apple's PowerBook 500 series of laptops proved very popular in the mid-90s. But just as the lineup was being discontinued, one final model trickled out of the factory and onto the store shelves of a single country.

Sources:
540c PowerPC upgrade sticker image: paizhang.info/wp-content/uploads/2019/01/7793_20.jpg
PowerBook 550c cellular modem: flickr.com/photos/raneko/2373696346/sizes/o
Customized PowerBook 550c: sekinesan.jp/blog/2008/03/15/1498
JLPGA PowerBook 170 images: alexsappleorchard.blogspot.com

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