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I work at a multi billion dollar facility for a Fortune 100 company and we still depend on DOS. Keeping the mandatory DOS machines going is an exercise. Especially integrating them into modern systems.

Edit: There is no required hardware, however maintaining a stable serial connection through a VM and timing issues due to faster hardware has been fun.

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The serial port stuff is very close to what I'm working on - what's on the other end of the connection? What does "integrating them into modern systems" look like for you: getting data out/pushing data in/both?

We typically integrate them by encapsulation. Building multiple layers of more modern systems for them to communicate through. A combination of Windows and Linux boxes. The other end of the connection is very old industrial equipment. This is not to run the equipment per se but to configure and program it.

Actual MS-DOS or FreeDOS?

MS-DOS or Windows 2003 running DOS vdm.

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