In 1983, Bob Zale
, PowerBASIC's founder,
created BASIC/Z, the first interactive compiler for CP/M and MDOS.
It was extended to MS-DOS, and in 1987 Borland published it as the
now legendary Turbo BASIC. The compiler became officially known as
PowerBASIC in 1990 when Bob Zale founded PowerBASIC Inc.
TimeLine of BASIC Dialects
Here's a timeline I've put together showing how PowerBASIC fits
in with the development of other BASIC dialects, as well as with the
DOS/Windows development cycles.