My understanding of how a COM program really works (in real life)   
   is that DOS reserves ALL 640K memory and all segments are supposed   
   to point to the code segment (64K or less). When you reallocate it   
   is up to you to define the SS. If you are mixing your COM program with   
   other code not in ASM then as Emilly Latella would say (never mind),   
   might as well use an EXE. I routinely use all available ram with tiny COM   
   programs and have never had a problem, but for COM programs NASM   
   doesn't assume anything, you must tell it.   
   Steve   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)