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BASIC09 is a version of the BASIC programming language designed to operate on the Motorola 6809 microprocessor, which was used in late-1970s and early-1980s home computers. The language has extensions that allow it to manipulate the hardware directly. Its commands are similar to other BASIC dialects with features such as line labels, subroutines, loops, and conditional statements. BASIC09 can create GUI applications by calling OS routines to draw windows and perform other user interface tasks without deep system knowledge.