BASICA
BASICA is a BASIC interpreter developed by Microsoft and included with early versions of PC-DOS. It requires ROM BASIC (a BASIC interpreter contained in a ROM chip; a standard feature of the earliest IBM PCs) to function correctly. After a few years, BASICA was superseded by GW-BASIC. (GW-BASIC is identical to BASICA, except that where BASICA requires ROM BASIC, GW-BASIC is entirely contained within the interpreter itself. It was included with several versions of DOS, and was eventually superseded by QBasic.)
BASICA is an implementation of BASIC.
Other implementations of BASIC.