Assembly newbie question

Code:

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....
      mov    dx,OFFSET FNAME
      mov    ax,3D02H           
      int    21H
      jc      FOK_NZEND         

      mov    bx,ax             
      push    bx                 
      mov    cx,5             
      mov    dx,OFFSET START_IMAGE     
      mov    ah,3FH             
      int    21H

      pop    bx                 
      mov    ah,3EH
      int    21H               

      mov    ax,WORD PTR [FSIZE]
      add    ax,OFFSET ENDPROG - OFFSET PROG 
      jc      FOK_NZEND         
      cmp    BYTE PTR [START_IMAGE],0E9H 
      jnz    FOK_ZEND           
      cmp    WORD PTR [START_IMAGE+3],4956H 
      jnz    FOK_ZEND           
....

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Hi im trying to learn assembly.
Above lines are intended to assembled with TASM. but im using NASM and when i assemble them with nasm, i get errors for lines with OFFSET, WORD PTR and BYTE PTR. How can fix the code to assemble it with nasm. (when i just delete above statements (eg. mov dx, FNAME) thoes errors dont show up, but is it right to do that?)

thanx.

OFFSET means "the address of within the current segment". I think you can just remove that all together - it will be obvious if it works or not.

WORD PTR, etc, you need to put the size without ptr inside the [], e.g. [word: blah] will access blah as a word.

See the NASM manual: http://nasm.sourceforge.net/doc/nasmdoc0.html

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Mats

worked. thanks.