What belongs in a Delphi system assessment
Build chain
Compiler version, project groups, conditional defines, search paths, third-party source or DCUs, runtime packages and resource files.
Data layer
BDE aliases, Paradox or dBase tables, InterBase/Firebird clients, ODBC drivers, SQL dialect and transaction behavior.
External behavior
COM automation, DLL calling conventions, serial devices, printers, scanners, file exchange and scheduled processes.
Failures that appear after years of stability
| Symptom | Likely cause families | Useful evidence |
|---|---|---|
| Missing BPL or DLL | Runtime-package deployment, architecture mismatch, search path or vendor component | Exact module name, executable imports, original installer |
| Application starts but data fails | BDE configuration, client-library version, permissions, aliases or locale | Database files, configuration and known-good machine |
| Project no longer compiles | Missing component packages, source-path assumptions, compiler-version changes | Full build log, DPK/DCP/DCU files, installed-package list |
| Hardware workflow is unreliable | Timing, driver changes, serial settings or undocumented protocol state | Traffic capture and repeatable device sequence |
Choosing the intervention
Maintain the current code when the build is reproducible, behavior is still valuable and dependencies remain controllable. Preserve the compiler and component environment when rebuilding it later would be costly. Upgrade Delphi only when component and database compatibility have been assessed; compiler changes can expose Unicode, pointer-size, API and package assumptions.
Replace a subsystem rather than the entire application when one obsolete database engine or device interface creates most of the risk. A full rewrite is justified only when requirements can be recovered and verified independently of the old user interface.
Engineering paths
Start with Delphi legacy application support when continuity or build recovery is urgent. Use startup diagnosis for a failing executable, Delphi reverse engineering for incomplete source and BDE migration when database coupling is the modernization boundary.
Delphi systems frequently require separate work on legacy databases, industrial communication and undocumented dependencies.
Useful material to preserve
- All source roots, project groups and installer projects
- Compiler and component installers with license material
- Working binaries and runtime packages
- Database files, aliases and client configuration
- Device manuals, captured traffic and sample files
Build and deployment diagnostics
Use missing BPL diagnosis for Delphi runtime packages and DLL analysis for native libraries. Assess project completeness through source analysis, then choose preservation, compiler upgrade or replacement through Delphi modernization.
Database and device boundaries
For modern deployment use BDE on Windows 11; for application-aware data recovery use Delphi Paradox recovery. Serial implementation and maintenance are covered by Delphi serial communication.
Database and COM-port integrations
Maintain InterBase applications, plan Delphi Firebird migration, assess SQL Server integration and isolate serial defects through Delphi COM-port troubleshooting.
Data and hardware integration
Trace driver and connection-layer faults with Delphi ODBC troubleshooting. For device-facing systems, use Delphi hardware integration to map drivers, SDKs and timing, or the focused barcode scanner integration guide.
Application and toolchain recovery
Restore an existing system through old Delphi application recovery, reconstruct the compiler and component set with build-environment recovery, and use Delphi 7 migration for a staged compiler and platform transition.
Version-specific support
Use the focused support paths for Delphi 6, Delphi 7 and Delphi 2007.