The interpreter originally shipped on an 8 KB ROM cartridge; on the XL/XE computers it is built in and can be disabled by holding down the OPTION key while booting the computer.
The interpreter originally shipped on an 8 KB ROM cartridge; on later XL/XE model computers it is built in. On the XL/XE models, Atari BASIC can be disabled by holding down the OPTION key while booting the computer.