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   comp.sys.apple2      Discussion about Apple II micros      56,720 messages   

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   Message 54,956 of 56,720   
   fadden to All   
   Improving IIgs shadow copy speed with NO   
   09 Sep 21 08:59:20   
   
   From: thefadden@gmail.com   
      
   Many years ago I was told that inserting NOPs into IIgs screen updates could   
   actually make things faster, because of the way the different hardware   
   components interact when you're doing a fast copy with shadowed memory (insert   
   a NOP every 8 or 13 PEIs).     
   Somebody attached a logic analyzer to a IIgs and timed it a few different   
   ways, and determined that there is actually no value to adding NOPs:   
      
   https://retrocomputing.stackexchange.com/q/228/56   
      
   Is there a flaw in their test methodology, or was this actually a myth?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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