Am 01.06.2025 um 18:47 schrieb Eric J Korpela via Cygwin:
To be more explicit, a text mode windows program is not a DOS program. It will do anything useful on a DOS system without windows.
^ not
If you desire 32-bit protected mode DOS programs, DJGPP may be your best option. New builds of DJGPP are available at http://www.delorie.com/djgpp/ . I'm not sure if the current binaries run correctly under cygwin as they are programs that run under a DOS extender.
They won't, and Cygwin itself has no way of changing that. 64-bit editions of Windows cannot run anything 16-bit (technically, the V86 mode is gone from both the CPUs and the system). That does mean DOS itself is not available, and therefore nothing expecting to run in DOS can run either.
What Cygwin does have is a set of cross-compilation tools to the DJGPP environment. Those allow you to cross-build DJGPP executables on Cygwin, but they can't run there.
It takes something like FreeDOS in a VM to get the original DJGPP itself, or any of the programs it builds, to run inside any remotely up-to-date Windows.
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