Expandability and upgrades thumb|AirPort Extreme installed in an iBook G4 The iBook keyboard lifts up, allowing installation of the AirPort (wireless) card and additional memory. This gives the keyboard a "spongy" effect, especially in G3 iBooks with the translucent keyboard. The "sponginess" was corrected in the PowerPC G4 models.
expandability and upgrades thumb|airport extreme installed in an ibook g4 the ibook keyboard lifts up allowing installation of the airport (wireless) card and additional memory this gives the keyboard a "spongy" effect especially in g3 ibooks with the translucent keyboard the "sponginess" was corrected in the powerpc g4 models