From HwB

GTIA = Graphics Television Interface Adapter

GTIA is a television interface chip. It's available on Atari 8-bit computers: 400, 800, 65XE, 130XE, 600XL, 800XL, 800XE & 1200XL.

  • GTIA, PAL: CO14889
  • GTIA, NTSC: CO14805
  • FGTIA, SECAM: CO20120

Early North American 400/800 models shipped with CTIA, later models and all european 400/800 shipped with GTIA.