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Re: A German user here ???

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Hi,

Michael Schwingen writes:
> Francois LE COAT wrote:
>> I won't argue. It's written 120MHz on the face side of the computer.
>
> That is then plainly wrong.

There's cabled green LEDs displaying "120" for 120MHz on the face side.
It was shipped like this by Medusa Systems, and the advertisements for
the computer said the Hades060 was clocked at 120MHz:

<http://download.abandonware.org/magazines/ST%20Magazine/stmagazine_numero121/st%20magazine%20-%20N121%20-%20novembre%201997%20-%20page083.jpg>

Do you intend to say that Fredi Aschwanden was a liar shipping very
expensive hardware, with false characteristics ? I don't think so.

>> 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 !
>
> It may be run as fast as a 68040 clocked at 120MHz, bit it *is not clocked*
> internally at 120MHz - that's the thing about being superscalar.

Yes, I know. MC68060 has a double pipeline handling two consecutive
instructions at the same time, what is doubling the execution rate.

> There is an important difference: a superscalar CPU will only get that
> performance some of the time - it is not always 2* speed, it depends on the
> mix of instructions - only some can be dispatched to the second execution
> pipeline.

Two instructions are executed in parallel at the same time with the
double pipeline, considering that these instructions are independent.
The full speed can only be obtained in this case, otherwise the
pipeline is broken. This is the responsibility of the compiler to
dispatch independent consecutive instructions to obtain full speed.

>> I'm not arguing about the Motorola's documentation, but real hardware.
>
> This *is* the documentation for the real hardware - you won't get it any
> more exact than from the manufacturer of the CPU.

The documentation is free, but the Hades060 cost me 3000Euros in 1996.
That was the first Hades ever sold in France, that launched the market.

ATARIstically yours,

-- 
François LE COAT
Author of Eureka 2.12 (2D Graph Describer, 3D Modeller)
http://eureka.atari.org/

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A German user here ??? Arachide <houten.van@orange.fr> - 2015-11-29 16:57 +0100
  Re: A German user here ??? Dennis Schulmeister <usenet@windows3.de> - 2015-11-29 19:42 +0100
    Re: A German user here ??? Arachide <houten.van@orange.fr> - 2015-11-29 20:09 +0100
      Re: A German user here ??? Francois LE COAT <lecoat@atari.org> - 2015-11-29 23:45 +0100
        Re: A German user here ??? Michael Schwingen <news-1326478115@discworld.dascon.de> - 2015-11-29 23:29 +0000
          Re: A German user here ??? Francois LE COAT <lecoat@atari.org> - 2015-11-30 00:46 +0100
            Re: A German user here ??? Michael Schwingen <news-1326478115@discworld.dascon.de> - 2015-11-30 13:26 +0000
              Re: A German user here ??? Francois LE COAT <lecoat@atari.org> - 2015-12-01 22:15 +0100
                Re: A German user here ??? Michael Schwingen <news-1326478115@discworld.dascon.de> - 2015-12-02 20:46 +0000
                Re: A German user here ??? Arachide <houten.van@orange.fr> - 2015-12-03 08:40 +0100
                Re: A German user here ??? calimero <milankovach@gmail.com> - 2015-12-03 04:29 -0800
                Re: A German user here ??? Arachide <houten.van@orange.fr> - 2015-12-03 19:13 +0100
                Re: A German user here ??? Michael Schwingen <news-1326478115@discworld.dascon.de> - 2015-12-04 09:30 +0000
                Re: A German user here ??? Francois LE COAT <lecoat@atari.org> - 2015-12-03 21:40 +0100
                Re: A German user here ??? Miro Kropáček <miro.kropacek@gmail.com> - 2015-12-03 22:31 -0800
        Re: A German user here ??? Tonton Th <tTh@nowhere.invalid> - 2015-11-30 11:27 +0000

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