Atari built a series of 8-bithome computers based on the MOS Technology 6502CPU, starting in 1979. Over the next decade several versions of the same basic design would be released, but the models remained largely identical internally.
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Available programming languages
Atari BASIC — This was the original BASIC for the Atari 8-bit family. Came as a ROM cartridge with the Atari 400/800 models, but was built into the computer's ROM in later models.
Microsoft BASIC — A version of BASIC for the Atari 8-bit family released by Atari that was more like the industry standard Microsoft BASIC. This did not catch on.
Turbo Basic XL — An improved version of Atari BASIC released by a third party that is not only faster, but offers many more commands. There is also a compiler that makes Turbo-BASIC XL programs even faster by compiling them int machine-language binaries.
Behind the open cartridge door of the Atari800 were two latches (later replaced by screws) which when opened revealed an expansion bay within the top of the Atari800.
Atari also encased its expansion boards inside of custom cases so that they could be handled as easily and safely as cartridges.
Atari would later introduce a replacement for the 830 called the 835 Direct Connect Modem and this device was an SIO compatible device, therefore not requiring the 850 interface.