 The first @-@ generation iPad features an Apple A4 SoC , which comprises a 1 GHz processor , 256 MB of RAM and a PowerVR <unk> GPU . There are four physical switches on the iPad , including a home button near the display that returns the user to the main menu , and three plastic physical switches on the sides : wake / sleep and volume up / down , plus a software @-@ controlled switch whose function has changed with software updates . Originally the switch locked the screen to its current orientation , but iOS 4 @.@ 2 changed it to a mute switch , moving the rotation lock function to an onscreen menu . In the iOS 4 @.@ 3 update , a setting was added to allow the user to specify whether the side switch was used for rotation lock or mute . Unlike its successors , the first @-@ generation iPad has no cameras . 
