When the MS-DOS operating system came out, it incorporated the GWBASIC.EXE or BASICA.EXE interpreters. GWBASIC ("Gee Whiz") incorporated graphics and a screen editor and was compatible with earlier BASICs.
QBASIC was more sophisticated. Version 4.5 had a full screen editor, debugger and compiler. The compiler could also produce executable files but to run these a utility program (BRUN44.EXE) had to be present. Thus source code could be kept private.
From DOS 5.0 or 6.0 onward, MS-BASIC was standard.
Version 1.1 produced stand-alone executables and could display graphics.
[Relationship to BASIC in ROM on first IBM PC?]
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