The Atari 1200XL is an enhanced version of the existing Atari computer systems. It can be used with any existing Atari peripheral devices which are compatible with the 400/800 computer, although not all are necessary.

The console contains 64K of RAM and has an operating system which contains two 8K X 8 ROMs. The console also contains the keyboard with a HELP key, four application function keys, a single cartridge slot, connector jacks for adding peripherals and hand controllers, a detachable (RF) TV interface cable and three status LED's.