Get both the CXL4002 cartridge and the book: Inside ATARI BASIC A Fast, Fun, and Friendly Approach by Bill Carris.
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1982 CXL4002 is for use in Atari 400, 600, 800 home computers.
Inside Atari Basic is designed to be used with either the ATARI 400 or 800 home computers.
Both cartridge and book are in EXCELLENT condition.