Atari 800
- Created in 1979
- Available in Europe and America, possibly others
- Uses a 6502 CPU @ 1.97mHz
- 10kb ROM
- 48kb RAM
- 40x25 Text mode
- Maximum Resolution of 320x192
- 16 Colours available, each having 8 different tones giving a max of 128 colors in low res
- Sound has 4 voices, 3.5 octaves
- I/O Ports are RGB, Composite, 2 Cardridge slots, Bus, RS232c, 4 Joystick, Tape, 4 Internal slots

Atari 800 XL
- Created in 1982
- Available in Europe and America, possibly others
- Uses a MOS 6502C CPU @ 1.79mHz for NTSC and 1.77mHz for PAL
- 24kb ROM
- 64kb RAM expandable to 128kb
- Five text modes, max being 40 x 24 and min being 20 x 12
- 15 graphic modes, maximum being 320 x 192
- 16 colours each having 16 tones
- Four sound channels with 3.5 octaves
- I/O Ports available are RGB, cartridge, Expansion port, Tape, RS232, 2 joystick inputs
- ROM BASIC Operating System