From: gneuner2@nospicedham.comcast.net   
      
   On Wed, 16 Nov 2022 05:33:51 -0800 (PST), Paul Edwards   
    wrote:   
      
   >I'm wondering how a C "hello world" could have worked in small   
   >memory model C compiler (any vendor) when the "hello world"   
   >string could come from either a buffer on the stack or a data   
   >variable.   
   >   
   >It somehow magically worked.   
      
   I may be mis-remembering [it has been a long time], but I believe the   
   "small" model was 64K code, 64K data, DS = SS.   
      
   "tiny"    was 64K code + data, CS = DS = SS.   
   "compact" was 64K code, 1MB data, DS != SS   
   "medium"  was 1MB code, 64K data, DS = SS   
   "large"   was 1MB code, 1MB data, DS != SS, 4:16 pointers   
   "huge"    was 1MB code, 1MB data, DS != SS, 16:4 pointers   
      
      
   >I didn't need to stuff around in my hello world application program -   
   >someone else magically dealt with that.   
   >   
   >Now I'm trying to understand magic.   
      
   No magic, just either saving/restoring the segment register around   
   code that messes with it.  Or liberal use of segment overrides.   
      
   >Thanks. Paul.   
   George   
      
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