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Possible conversions:

1) In this case you need to declare MY_SYS to some non-zero value to get (a) assembler or to zero to get (b) assembled, but it won't work if you don't declare MY_SYS at all:

MY_SYS = 1



if MY_SYS

 ; (a)

else

 ; (b)

end if

2) Second case can handle the case of undefined MY_SYS:

MY_SYS equ 1



if defined MY_SYS

 ; (a)

else

 ; (b)

end if

You can also use such nice macros:

macro define name

{ name equ 1 }



macro undefine name 

{ local undefined

  name equ undefined }



ifdef equ if defined

ifndef equ if ~defined

For example

define MY_SYMBOL



ifdef MY_SYMBOL

 ; (a)

end if



undefine MY_SYMBOL



ifndef MY_SYMBOL

 ; (b)

end if

Both (a) and (b) will be assembled in this case.