Released along with the 800 in 1979, the 400 was the low-end model of the two.
The only 8-bit Atari with a membrane keyboard rather than a full-stroke
keyboard.  One of the few 8-bit Ataris lacking a composite monitor port.
Originally released with just 8K RAM, but most were sold with 16K RAM.

Atari sold the 48K RAM Expansion Kit for the 400, which required a little
soldering, to dealers only.

Only the 400 and 800 8-bit Atari models have four controller (joystick) ports.

The 400 was produced in both NTSC (North America) and PAL (Europe) versions.
Early 400 units contain the CTIA chip; later units, including all European/PAL
units, contain the GTIA chip, which is also present in all later 8-bit Ataris.

Atari marketing used the trademark, The Basic Computer, as an alternative name
for the 400 from 1981-1982.

The 400 was made in the USA (early production) and Hong Kong (later).

Production of the 400 ended in May 1983.

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