From: user5857@newsgrouper.org.invalid   
      
   quadi  posted:   
      
   > On Thu, 12 Feb 2026 10:53:58 +0200, Michael S wrote:   
   >   
   > > Was not quality of arithmetic of CDC machines of the 70s even worse than   
   > > that of IBM ?   
   >   
   > I don't know about that. But I do know that despite having a power-of-two   
   > exponent, quality of arithmetic on the Cray I was pretty terrible.   
      
   Unlike CDC 6600/7600, CRAY multiply did not have a full 'tree' of   
   multiplication logic--leading to all sorts of "headaches" for   
   numerical analysists. Given a 4×4 set of multiplication gates,   
   cray only used 80%-odd of the required macros to get multiplication   
   'right'.   
      
   > John Savard   
   >   
      
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