Byron Desnoyers wrote in a message to All:

 BD> I finally stumbled on an IBM OS/2 (80x86) assembler and I
 BD> would like to know the differnces between DOS and OS/2
 BD> assembly language.  I assume all of the instructions are
 BD> still available and that DOS interrupts are not available,
 BD> but what does OS/2 replace the DOS interrupts with?

You can write "pure" assembly code in OS/2 very much like you do
in DOS.  "Pure" is a technical term relating to what is legal in
protected mode.  For example, you are not allowed to modify the contents of
a code segment.  Some instructions, such as HLT or CLI, are also illegal in
protected mode applications and will cause a trap back to the operating
system.

The stack-based OS/2 API is available by using extern proc declarations and
then linking with the appropriate import library.  There are macro and API
headers available as INC files in the OS/2 Toolkit.

 BD> Then there is LINK386.  I assume LINK386 is what I will need
 BD> to link OS/2 executables, but I can not find any
 BD> documentation on how to use it.

You can get basic usage information with "LINK386 /?" but the
official documentation is in the TOOLINFO.INF file that is part of the OS/2
Toolkit, which is distributed on the IBM OS/2 Developer Connection CD and
included with some compilers.  (There is also an earlier version of this
file called TOOLINFX.INF with only minor differences.)
 
-- Mike


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