version 1.0, in 1987 - It offered the first integrated edit-compile-run development environment for C on IBM PCs, borrowed from Borland's existing Turbo Pascal compiler. It ran in 384KB of memory. It allowed inline assembly, supported all memory models, and offered optimisations for speed, size, constant folding, and jump elimination.
Version 1.5 - It was shipped on five 360 KB diskettes of uncompressed files, and came with sample C programs, including a stripped down spreadsheet called mcalc.
Version 2.0 - It had a debugger, a fast assembler, and an extensive graphics library.
