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   comp.sys.atari.st      Discussion about 16 bit Atari micros      15,439 messages   

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   Message 15,028 of 15,439   
   Francois LE COAT to Michael Schwingen   
   Re: A German user here ???   
   30 Nov 15 00:46:00   
   
   From: lecoat@atari.org   
      
   Hi,   
      
   Michael Schwingen writes:   
   >> MC68060 processor of my Hades060 is internally clocked at 120MHz.   
   >   
   > No, it is not. The MC68060 is superscalar (for integer, not floating-point),   
   > meaning it executes up to two integer instructions per clock cycle (in   
   > certain conditions).  That means given the right instructions, it runs   
   > (nearly) *as fast as* a theoretical singlescalar CPU which runs at 120MHz,   
   > but the internal logic of the MC68060 is nevertheless only clocked at 60MHz.   
   > Also, with worst-case code, it falls back to singlescalar operation (see   
   > section 10.1 in the datasheet).   
   >   
   > The datasheet is quite clear in stating that internal logic is clocked at   
   > "clk" pin speed, not 2*"clk".   
      
   I won't argue. It's written 120MHz on the face side of the computer.   
   This has a meaning, because with the same external clock frequency,   
   60MHz and with a MC68040 CPU, it should be written 60MHz on the Hades040   
      
   Well, but I have a Hades060 machine since about twenty years now. I made   
   benchmarks, and it is fast as it was announced on its face side !   
      
   I'm not arguing about the Motorola's documentation, but real hardware.   
      
   ATARIstically yours,   
      
   --    
   François LE COAT   
   Author of Eureka 2.12 (2D Graph Describer, 3D Modeller)   
   http://eureka.atari.org/   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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