So back in the day I wrote something vague about the October 1991 preview version of Windows NT, and after messing with the tools and building f2c & dungeon (among some other stuff) one that that stuck out to me is that the object files had to be converted for NT.

The interesting thing is of course that it doesn’t support the cl386 direct compile and link (hence CL). Instead you have to compile, convert and then link. A fun thing about the October 1991 version is that there is a cl386 cross compiler for OS/2. So while looking around for OMF linkers (and assemblers that either understand GAS but output OMF, or some translator) I ran across this, and well yeah, it turns out that the OS/2 tool chain is the toolchain. I guess it makes sense in that the NT team was using OS/2 to build NT, but objects and exe’s were not solidified.

I think 6.00.080 was the last version of Microsoft C 386 for OS/2. I need to start collecting more of the SDK/DDK’s of the mixed era, I think the LX/OMF stuff was a bit more widespread hiding in plain sight.

Anyways, interesting?! sure. useful? Maybe 30 years ago. Although I’d probably say just use Watcom C/C++ instead of Microsoft C 6.00