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Note that console comes with FOUR cartridges. An error was made in the title.
The 1056 Board -- Atari 400 1056k Memory Upgrade
$72.95
POKEY NEW C012294/CO12294 (IC) for Tempest Arcade/Atari 400/800/XL/XE
$75.00
Integrated Circuit(IC) Atari 400/800 ANTIC C012296 NO PCB
$7.95
Documentation