Version 1.5, in January 1988 was an incremental improvement over version 1.0. It included more sample programs, improved manuals and bug fixes. It was shipped on five 360 KB diskettes of uncompressed files, and came with sample C programs, including a stripped down spreadsheet called mcalc. This version introduced the <conio.h> header file (which provided fast, PC-specific console I/O routines). (Note: The copyright date in the startup screen is 1987, but the files in the system distribution were created in January 1988.)
Version 2.0, in 1989 was released was in late 1988, and featured the first "blue screen" version, which would be typical of all future Borland releases for MS-DOS. The American release did not have Turbo Assembler or a separate debugger. (These were sold separately as Turbo Assembler.) Turbo C, Asm, and Debugger were sold together as a suite. This seems to describe another release: Featured Turbo Debugger, Turbo Assembler, and an extensive graphics library. This version of Turbo C was also released for the Atari ST, but distributed in Germany only.
Note on later releases: The name "Turbo C" was not used after version 2.0, because with the release of Turbo C++ 1.0 with 1990, the two products were folded into a single product. That first C++ compiler was developed under contract by a company in San Diego and was one of the first true compilers for C++ (until then, most C++ work was done with pre-compilers that generated C code). The next version was named Borland C++ to emphasize its flagship status and completely rewritten in-house, with Peter Kukol as the lead engineer. The Turbo C++ name was briefly dropped, eventually reappearing as Turbo C++ 3.0. There was never a 2.0 of the Turbo C++ product series.
- 1987: Turbo C 1.0
- 1987: Turbo C 1.1
- 1988: Turbo C 1.5
- 1989: Turbo C 2.0 (now with integrated debugger, also for the Atari ST)
- 1990: Turbo C++ 1.0
- 1991: Turbo C++ 1.01
- 1991: Turbo C++ 2.0
- 1992: Turbo C++ 3.0