XPost: comp.lang.misc, sci.physics   
   From: already5chosen@yahoo.com   
      
   On Sun, 7 Dec 2025 11:42:40 +0100   
   Janis Papanagnou  wrote:   
      
   > On 2025-12-07 10:22, Thomas Heger wrote:   
   > > Am Donnerstag000004, 04.12.2025 um 09:57 schrieb Janis Papanagnou:   
   > >> [...]   
   > >> That's the date of the Z1, isn't it? - The Z3 came later, 1941.   
   > >   
   > > Sure, but the first computer using 'von Neumann architecture' was   
   > > actually the Z1 of 1937.   
   >   
   > Well, yes. At least mostly. That's why I've written upthread that   
   > the concepts from the earlier Z1 were reused in Z3.   
   >   
      
   I'd say, no. Neither Z1 nor Z3 are von Neumann architecture computers.   
   And it has nothing to them being either electronic or mechanical.   
   The key element (==distinguishing feature) of von Neumann architecture,   
   at least in modern (say, of last 60-65 years) meaning of the term   
   is that program store and data memory reside in the same space. Which   
   leads to possibility of self-modifying code. Which led to Von   
   Neumann's claim that index register is unnecessary for array   
   processing. Which is undeniable mathematical truth and serious   
   engineering mistake at the same time.   
      
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