Hello Flemming,
 DB>>     push    CS
 DB>>     pop     DS
 DB>>     mov     SS,[_SS]    ;restore them back again
 DB>>     mov     SP,[_SP]
 DB>>     ...
 FS> Are you sure this is safe? You are using the stack here. Not good when 
S
 FS> and SP are messed up, eh? :)
 FS> There's nothing wrong with:
 FS>          mov       ss,cs:[_ss]
 FS>          mov       sp,cs:[_sp]
      I don't see the problem. push,then pop. Stack is not altered, right?
      However, I tried the tsr with Denis's change and it still crashes :)
      More needs to be done.
Kind regards, Barry 
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