Joe Negron wrote in a message to Mike Bilow:

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

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

JN> MASM, up to v6.00b, supports OS/2.

MB> Try it. :-)

 JN> Mike, does MASM 6.0b produce code which will run under OS/2?

Well, yes, but that's not the same thing as supporting OS/2.  MASM 4.0 for
DOS will produce code that will run under OS/2, after all -- it's just an
assembler that makes OBJ modules.  However, MASM changed a lot of
syntactical conventions from 5.1 to 6.0, and this broke quite a lot of
working assembly code including the OS/2 include files.
 
-- Mike


---