Hello Pablo,
 PB> I have a doubt about the function 4bh of the int21h, execute
 PB> program. When it's done by Dos, does it check if there's enough room to
 PB> load the program before or after making the int21h ( 4bh ) ? I mean, 
oes
 PB> Dos ensure that there is enough unallocated memory avaiable before
 PB> executing ?
     Test it. Allocate something silly and see if a carry flag or something
     (ax?) is set.
Kind regards, Barry
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