> I had a fully deterministic game engine in 1991 and, funnily enough, a few days ago with the help of Claude Code CLI / Sonnet 4.6 I compiled that old game of mine again (I may put it on a public repo one day): I still had the source files and assets after all those years, but not the tooling anymore (no more MASM / no more linker) so I had to "fight" a bit (for example I had not one but two macros who now clashed with macros/functions used by the assembler: "incbin" and another one I forgot) to be able to compile it again (now using UASM, to compile for DOS but from Linux).

Fun thing - I'm working on modernizing a legacy Fortran / Win32 application to something a bit more modern, and ran into similar issues with toolchain not being available anymore; and further some libraries where source is needed to compile, but only have binaries of the libraries.

Claude Code was amazing creating stubs by looking at function calls used and how, and then getting just enough in place to call existing binaries correctly; and further updating the code to be in alignment with Fortran specs that can compile on existing compilers - but it was a 'fight'.