Microsoft OS/2 SDK 1.01
Released August 1987 by Microsoft
For DOS with Microsoft C

1.01 consists of a single disk update, the OS/2 program disk, to the
1.00 set. 1.01 is only a minor change that adds a program selector.

This archive contains the 1.01 program disk, as well as the May 1987
SDK 1.00 disks, but it is missing the 1.00 program disk (probably
disk 1), and apparently another disk (disk 2, but it is not clear
what should be on that disk).

Manuals can be found on Archive.org:
https://archive.org/details/os2-sdk-v1-1987

"This SDK contained a pre-release build of OS/2, not OS/2 1.0. Also
included were beta versions of Microsoft MASM and C, both with a 4.50
version tag. The SDK came with a heavy stack of printed documentation
which covered the new operating system, the complete C and MASM
development systems, and OS/2 programming documentation.

In addition, the OS/2 SDK shipped with the full Microsoft Windows
1.04 SDK which included Windows 1.04 itself, programming tools and
libraries, as well as Microsoft C 4.0, required to develop for
Windows.

The operating system was clearly unfinished, yet quite usable. The 
multi-tasking shell was very spartan. There was no online help, some 
utilities were missing, hardware beyond PC/AT compatibles was 
unsupported. Still, it was possible to use the system to develop OS/2 
software. The C compiler and MASM were marked as beta, but could 
build the sample applications without major issues. Documentation was 
incomplete, there were numerous references to DOS 5 rather than OS/2, 
but the system was functional."
