Jeff Patten wrote in a message to Mike Bilow:

 DK> MASM 5.1 is for OS/2 and DOS.

 ET> What about the ones after 5.1?  I would assume that they
 ET> would also (Unless Microsoft got a jealous...).

 MB> For marketing and business reasons, Microsoft withdrew OS/2
 MB> support and development after MASM 5.1 and C 6.0. 

 JP> Shouldn't that be MASM 6.0b?  I'm pretty sure MASM 6.1 was the 
 JP> one where OS/2 support was removed and NT support added.

MASM 6.0 does not really support OS/2.  In fact, the developers writing NT
were originally running under OS/2 1.3, and MASM 6.0 was intended for that
specialized environment.  For this reason, IBM considers the last official
MASM version to have OS/2 support as 5.1, and this is what IBM uses to
build OS/2 itself and the DDK libraries and tools.

While MASM 6.0 will host under OS/2, it should be understood that it was
created in a period of transition when Microsoft's "OS/2 3.0"
project was becoming the NT project, and support for OS/2 targets has a few
problems.
 
-- Mike


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