Assembler: alignment of machine instructions

A DC or DS instruction with a zero duplication factor forces boundary 
alignment, even when the NOALIGN assembler option is in effect.

At the other hand, IMHO, the assembler always aligns machine instructions
on 
a halfword boundary.

So, I'm wondering why the expansion of the SAVE macro begins with a DS 0H.

That's redundant, isn't it?

Or are there some historical reasons? If yes, which ones?

The first one to provide me with the correct information will receive a
copy 
of my new assembler course.

Regards,

Michel


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Michel Castelein - Arcis Services
MVS-OS/390-z/OS system engineer & instructor
arcisATadvalvasDOTcom
http://www.geocities.com/michelcastelein/