What's the meaning of its parameter?
Does org affect align's behavior?
How can I align code or data to file address 200h,400h,600h and so on?

//The fasm manual doesn't explain this clearly.

Yes, the "org" affects "align", as the alignment is always done relative to $ address, which is affected by "org" - the alignment is done for the address in memory, not the pointer in file. Also "align" works only with powers of two, if you need some other alignments, use the old alignment macros.

I find that works well.
But since $ is relative to org, what if I want to get the absolute offset?

What do you mean by "absolute offset"?

If you don't use any org directive, then $'s value equal to "absolute offset".

If many org directives are used, then $'s value is relative.

Hi Liu. The word "relative" have several meanings in English language.


Privalov used it in the meaning: "Align changes the $ value and org changes this value too."

"org" directive simply changes the value of "$" internal variable. "align" also changes the value of "$" internal variable, but in another manner.

Regards.

To be more precise: "org" directive does not change value of "$" directly, it changes the addressing origin, which is used to calculate "$" - which is always obtained by substracting that origin from the current pointer in output code. And "align", like any instruction coded or data directives, put some new bytes into output, therefore modifying the current pointer, but not the addressing origin, which can be altered only with "org". And as the numer of byte that "align" puts into the output is dependent on the "$" value (as the "align" pads current pointer up to the nearest aligned "$" value), it's this way dependent on the addessing origin, too.