The PowerBook 2400 was the spiritual successor to the PowerBook Duo series. It did not have the same docking capabilities as the Duos did, but it was still very small and portable, and well loved by Mac users, especially those in Japan. Japan was the main market for the 2400c, as the US did not have a very large subnotebook market at the time. They were sold in the US in limited numbers, but not many did, and the 240MHz varient was never sold in the US at all.
The 2400c was co-designed by IBM and was also built by them. As such, the general build quality on the 2400c feels better than many of Apple's other laptops did.
See our page on IDE SSDs for more info.
Extra Note: Some brands of IDE to mSata adapters have been tested to work in the 2400c! Unfortunately, it seems to be the expensive 40-something dollar one with a red PCB.
The PowerBook 2400c's CPU is located on a daughtercard. As such, multiple companies released third-party G3 processor upgrades for the 2400. These upgrades were quite popular in Japan, as the 2400 had an entire subculture there, with many mods and upgrades being made.
The 2400 was so popular in Japan that companies came out with custom parts for the 2400, and many other individual users made their own customizations. One popular mod was to install an aftermarket transparent keyboard. Many users also custom painted their laptop's case parts in all sorts of fun colors.
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