TI BASIC is an ANSI-compliant BASIC programming language interpreter built into the 1979 Texas Instruments TI-99/4 home computer and its improved 1981 version, the TI-99/4A. In contrast to most BASICs found on contemporary microcomputers, TI BASIC does not trace its history to Microsoft BASIC, but was instead a TI-developed interpreter following the emerging Minimal BASIC standard being created by ANSI and ECMA. This was, in turn, based on the original Dartmouth BASIC from the 1960s. There are a number of differences, sometimes subtle, between TI BASIC and the more common MS varieties.