Why I’m writing a Windows 3 Emulator

Of note is, of course, that Wine already handles the 16-bit Windows API by mapping it (using some files containing API specs of arguments to replace) to its own Windows API implementation already.

It also seems to work under long mode, which implies that segmentation is handled through emulation or other compatibility behavior, as IIRC long mode does not even support segmentation in other execution modes.

It is a dupe but there are also more follow up articles on it.

When I was reimplementing the Classic MacOS Toolbox for a similar Macintosh Classic emulator, I encountered the same problem: documentation and knowledge is gone. And since the platforms (MacOS and Windows) still exist, it's hard to google for old information.

Aha. Worked out why it's flagged as a dupe, even though I did search HN first...

Different URL, different Title:

https://news.ycombinator.com/item?id=12529846

Lots more comments there.