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These models of PowerBooks were much sleeker and faster than the 100 series, which they replaced as the mid and high-end models.
The 500 series featured DSTN ( 520 ) or active-matrix LCD displays ( 540 and 550 ), stereo speakers, and was the first computer to use a trackpad ( although a similar technology had been included on the pioneering Gavilan SC 11 years earlier ); it was also the first portable computer to offer built-in Ethernet networking.
The 500 series was the first PowerBook to feature PCMCIA slots, although this was an optional feature which required the user to sacrifice one of the two available battery slots to house the PCMCIA expansion cage.
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