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The PowerBook 140 and 170 shipped with only 2 and 4 MB of RAM, respectively—barely adequate for their minimum operating system of Mac OS 7.0.1. While Apple insisted to western customers that only OS 7 could support the new machines' hardware features, delays in localizing it forced them to release these laptops in Japan with a hastily modified Kanji 6.0.7. Of course, users elsewhere immediately reverse-engineered this system to work in English, giving their laptops a substantial boost in speed and available RAM.