From: arne@vajhoej.dk   
      
   On 9/21/2025 1:08 PM, Arne Vajhøj wrote:   
   > On 9/20/2025 9:40 PM, Lawrence D’Oliveiro wrote:   
   >> On Sat, 20 Sep 2025 20:09:53 -0400, Arne Vajhøj wrote:   
   >>> On 9/20/2025 7:40 PM, Lawrence D’Oliveiro wrote:   
   >>>> Look at the current Top500 list of the world’s fastest machines; what   
   >>>> architectures do you see? IBM POWER offers a few contenders; also ARM,   
   >>>> I think MIPS, and of course the most common is x86-64. At some point no   
   >>>> doubt a RISC-V machine is likely to make an appearance.   
   >>>>   
   >>>> No IBM Z. Not before, not now, not ever.   
   >>>   
   >>> Not now.   
   >>>   
   >>> But once upon a time.   
   >>>   
   >>> IBM 3090 with integrated vector facility and the equivalent and   
   >>> compatible Amdahl vector.   
   >>   
   >> Was it ever competitive?   
   >>   
   >> No. That’s why it was abandoned.   
   >   
   > It was produced and sold for a number of years. In competition   
   > with Cray, NEC, Fujitsu etc..   
   >   
   > Production and sale stopped when the entire class   
   > (single super computers with vector aggregate) went   
   > away (and was replaced by distributed super computers).   
      
   I could of course also have included VAX 9000 with   
   Vector Option.   
      
   But I believe those were very rare.   
      
   Arne   
      
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