The Atari 8-Bit Computers uses games on cartridge.
The first Atari 8-Bit Computer is the Atari 400. It has 16K memory and not a good keyboard.
The Atari 800 computer is superior to the 400. It has 48K memory, a better keyboard and 2 cartridge slots.
The Atari 1200XL is superior. It has 64K memory.
The Atari 400, 800 and 1200XL require the Basic cartridge if you plan to write programs on them.
The Atari 600XL has 16K memory like the 400, but it has built in Basic and a better Keyboard than the 400.
The Atari 800XL has 64K memory and built in Basic.
The Atari 65XE has 64K memory and Built in Basic.
The Atari XEGS has 64K memory, built in Basic and detachable keyboard.
The Atari 130XE has 128K memory and built in Basic.
All of the Atari 8-Bit Computers use the Atari 2600 Joystick.
If you plan to save any programs you write, you'll need an Atari cassette recorder,
or an Atari Disk Drive. Certain Atari games were also sold on cassettes and Disks.