Operating System (OS)
The advantage(s) of incorporating the macro processor into pass 1 is(are):

many functions do not have to be implemented twice.
None of these
Functions are combined and it is not necessary to create intermediate files as output from the macros processor and input to the assembler.
more flexibility is available to the programmer in that he may use all the features of the assembler in conjunction with macros.
All of these

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Operating System (OS)
A co-processor

Works with any application
Is quite common in modern computer
Causes all processor to function equally
Is relatively easy to support in software

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