The ATI Rage is a video card that comes bundled with early Power Mac G3s and New World Macs (like the first revisions of the iMac G3). #Memory Map The ATI Rage can usually be located at IOBase (ex.: 0xF3000000 for Power Mac G3 Beige) + 0x9000. However, the video memory appears to be at 0x81000000.