From: joemonk64@gmail.com   
      
   > They were not "minor" changes. For example, the S/360 used core memory. How   
   much more memory (and hardware changes) would have been required to implement   
   32-bit memory as opposed to the 24-bit memory?   
      
   For instance, from the 360-91 functional characteristics, the processor   
   storage capabilities, the system could only have 2MB of main storage, and 4MB   
   of extended storage.   
      
   In 1960's memory was approximately $2.6 million per megabyte. So, a fully   
   loaded 360-91 with 6 megabytes of storage was north of $12 million in 1960   
   dollars.   
      
   According to the inflation calculator, $1 in 1960 buys the same as $10 today.   
   So, the same computer in todays dollars was  $120 million! And IBM spent $5   
   billion in 1960 dollars to develop the 360...   
      
   Joe   
      
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