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Turbo Pascal Toolchain, Part 5: From 6.0 to 7.0 - Compiler, Linker, and Language Growth

2026-02-22

Parts 1-4 covered workflow, artifacts, overlays, and BGI integration. This last part goes inside the compiler/language boundary: memory assumptions, type layout, calling conventions, and assembler integration from TP6-era practice to TP7/BP7 scope.

The TP6 to TP7 shift was less a language revolution and more an expansion of operational surface: ... continue

Turbo Pascal Toolchain, Part 4: Graphics Drivers, BGI, and Rendering Integration

2026-02-22

Turbo Pascal graphics was never just “call Graph and draw.” In production-ish DOS projects, graphics was an asset pipeline problem, a deployment problem, and a diagnostics problem at least as much as an API problem.

This part focuses on BGI driver mechanics, practical packaging, and the exact checks that separate real faults from folklore. ... continue

Turbo Pascal Toolchain, Part 3: Overlays, Memory Models, and Link Strategy

2026-02-22

This article is rewritten to be explicitly source-grounded against the Turbo Pascal 5.0 Reference Guide (1989), Chapter 13 (“Overlays”) plus Appendix B directive entries.

Structure map. 1) Why overlays existed—mechanism, DOS memory pressure, design tradeoffs. 2) TP5 hard rules and directive semantics. 3) FAR/near call model and memory implications. 4) Build and link strategy for overlaid programs. 5) Runtime initialization: OvrInit, OvrInitEMS, OvrSetBuf usage and diagnostics. 6) Overlay buffer economics and memory budget math. 7) Failure triage and performance profiling mindset. 8) Migration from non-overlay projects. 9) Engineering checklist and boundary caveats. ... continue

Turbo Pascal Toolchain, Part 2: Objects, Units, and Binary Investigation

2026-02-22

Part 1 covered workflow. Part 2 goes where practical debugging starts: the actual artifacts on disk. In Turbo Pascal, build failures and runtime bugs are often solved faster by reading files and link maps than by re-reading source. The tools are simple—TDUMP, MAP files, strings, hex diffs—but used systematically they turn “it used to work” into “here is exactly what changed.”

Structure map. This article proceeds in eleven sections: (1) artifact catalog and operational meaning, (2) TP5 unit-resolution behavior, (3) TPU constraints and version coupling, (4) TPU differential forensics and reconstruction when source is missing, (5) OBJ/LIB forensics and OMF orientation, (6) MAP file workflow and TDUMP-style inspection loops, (7) EXE-level checks before deep disassembly, (8) external OBJ integration and calling-convention cautions, (9) repeatable troubleshooting matrix with high-signal checks, (10) manipulating artifacts safely and team discipline for reproducibility, and (11) unit libraries and cross references. ... continue

Turbo Pascal Toolchain, Part 1: Anatomy and Workflow

2026-02-22

Turbo Pascal is remembered for a fast blue IDE, but that is only the surface. The real strength was a full toolchain with tight feedback loops: editor, compiler, linker, debugger, units, and predictable artifacts. Part 1 maps that system in practical terms before we dive into binary formats, overlays, BGI, and ABI-level language details.

Structure map. This article proceeds in twelve sections: (1) version and scope boundaries, (2) toolchain topology and component wiring, (3) artifact pipeline and engineering signal, (4) IDE options as architecture, (5) directory and path policy, (6) practical project layout, (7) IDE–CLI parity and reproducible builds, (8) units as compile boundaries and incremental strategy, (9) debug loop mechanics and map/debug workflow, (10) external objects and integration discipline, (11) operational checklists and failure modes, and (12) how this foundation supports the rest of the series. ... continue

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