Microsoft GW-BASIC

Software theme

GW-BASIC & IBM BASICA are functionally identical except IBM's requires a ROM (Cassette), the other is self-contained, & GW-BASIC has a compiler option

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Alternate names: IBM Advanced BASIC, BASICA

Documented 8088 assembly language source code for GW-BASIC was released by Microsoft on 2020-05-21 under the MIT license.

GW-BASIC was included with MS-DOS until superceeded by QBASIC with MS-DOS 5.0

The GWBASIC.EXE executable is named BASICA.EXE or some distrobutions. It is a bit perfect copy a GWBASIC.EXE file with a different name. (Therefore) BASICA.EXE is not IBM's BASICA.