Borland Turbo BASIC: The Compiler That Broke the 64KB Barrier
Borland Turbo BASIC began as BASIC/Z, the first interactive compiler for CP/M, written by Robert Zale. Borland bought it in 1987 and released it for MS-DOS, selling an estimated 80,000 copies in its first 10 weeks. Unlike GWBASIC's 64KB limit, it produced executables of any size and offered an integrated development environment. After Borland discontinued it, Zale reacquired the rights and continued it as PowerBASIC.
Borland International is not standing pat on the 80,000 copies of Turbo Basic the company estimated it sold in the program's first 10 weeks.