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Actually, the Borland's Turbo C 2.0 for MS-DOS had an example how to implement one.

Nice to see it in OCaml though.

I believe all of Borland's compilers all the way back to the original Turbo Pascal came with it.

I don't remember seeing it in the Turbo Pascal manuals. Used 3, 5.5, 6 and TPW 1.5.

But it might have been there as well.

I remember it in Borland C++ 3.1. If I remember correctly, it was one of the samples using BGI.

It's definitely in TP3 for PC. I still have the original floppy disk. I don't remember if it was in the earlier CP/M versions though.