Key points
- The project recovered 298 source files written in C and TASM from the 1991 BCC.EXE binary.
- Matching the original executable byte for byte required identifying the correct compiler, build options, and per-function adjustments.
- The reconstruction uncovered that 29 library modules had been built with Turbo C 2.01 and exposed a Borland bug involving strrchr and empty strings.
Context
The reconstruction shows how a legacy compiler toolchain and its undocumented build behavior can be inferred from an executable. For teams maintaining older systems, the result offers a rare path from binary-only preservation to source-level analysis without changing the original program's behavior.
What this means for you
Directly applicable
Developers can use the reconstructed source and documented toolchain quirks as references when maintaining Borland-based legacy systems.
Who benefits: Developers and technical decision-makers responsible for preserving or maintaining legacy software benefit from the reproducible source reconstruction.
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