| 25-machine AppleCrate [message #242730] |
Sat, 08 February 2014 01:59  |
Michael J. Mahon
Messages: 1767
Registered: October 2012
Karma: 0
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I just posted a new video to YouTube demonstrating a 25-node AppleCrate
resulting from connecting the AppleCrate II to the AppleCrate I.
I'd been wanting to do this for some time, but never cleared enough desk
space to make it possible. ;-)
Sometimes more really is better. ;-)
--
-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
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| Re: 25-machine AppleCrate [message #242762 is a reply to message #242730] |
Sat, 08 February 2014 10:18  |
a2retro
Messages: 76
Registered: June 2013
Karma: 0
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On Saturday, February 8, 2014 1:59:14 AM UTC-5, Michael J. Mahon wrote:
> I just posted a new video to YouTube demonstrating a 25-node AppleCrate
>
> resulting from connecting the AppleCrate II to the AppleCrate I.
>
>
>
> I'd been wanting to do this for some time, but never cleared enough desk
>
> space to make it possible. ;-)
>
>
>
> Sometimes more really is better. ;-)
>
> --
>
> -michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
Hi Michael, awesome video.
I didn't know you were working on a top secret Apple II bitcoin miner ;D
Glenn
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| Re: 25-machine AppleCrate [message #242917 is a reply to message #242730] |
Sun, 09 February 2014 03:54 |
sicklittlemonkey
Messages: 570
Registered: October 2012
Karma: 0
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Senior Member |
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On Saturday, 8 February 2014 19:59:14 UTC+13, Michael J. Mahon wrote:
> I'd been wanting to do this for some time, but never cleared enough desk
> space to make it possible. ;-)
That's a case where less is more. ; - )
Great video! You've got your own "Connection Machine". Have you ever tried using the AppleCrates for distributed rendering? A Mandelbrot set, say ...
BTW, NadaNet, AppleCrates and DAC522 form the best ever Apple hardware hack IMO. I can't think of anything that comes close.
Cheers,
Nick.
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| Re: 25-machine AppleCrate [message #242918 is a reply to message #242917] |
Sun, 09 February 2014 04:35 |
ajross.nz
Messages: 29
Registered: August 2013
Karma: 0
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Junior Member |
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Mind. Blown. :)
Just like Nick says, this really is the pinnacle of Apple ][ engineering. Really awesome stuff!
Cheers Michael
On 2014-02-09, sicklittlemonkey <nick.westgate@gmail.com> wrote:
> On Saturday, 8 February 2014 19:59:14 UTC+13, Michael J. Mahon wrote:
>> I'd been wanting to do this for some time, but never cleared enough desk
>> space to make it possible. ;-)
>
> That's a case where less is more. ; - )
>
> Great video! You've got your own "Connection Machine". Have you ever tried using the AppleCrates for distributed rendering? A Mandelbrot set, say ...
>
> BTW, NadaNet, AppleCrates and DAC522 form the best ever Apple hardware hack IMO. I can't think of anything that comes close.
>
> Cheers,
> Nick.
--
Alistair J. Ross
Sent from an Apple ][
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| Re: 25-machine AppleCrate [message #242930 is a reply to message #242918] |
Sun, 09 February 2014 06:03 |
Michael J. Mahon
Messages: 1767
Registered: October 2012
Karma: 0
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Alistair Ross <ajross.nz@gmail.com> wrote:
> Mind. Blown. :)
>
> Just like Nick says, this really is the pinnacle of Apple ][ engineering.
> Really awesome stuff!
>
> Cheers Michael
>
> On 2014-02-09, sicklittlemonkey <nick.westgate@gmail.com> wrote:
>> On Saturday, 8 February 2014 19:59:14 UTC+13, Michael J. Mahon wrote:
>>> I'd been wanting to do this for some time, but never cleared enough desk
>>> space to make it possible. ;-)
>>
>> That's a case where less is more. ; - )
>>
>> Great video! You've got your own "Connection Machine". Have you ever
>> tried using the AppleCrates for distributed rendering? A Mandelbrot set, say ...
>>
>> BTW, NadaNet, AppleCrates and DAC522 form the best ever Apple hardware
>> hack IMO. I can't think of anything that comes close.
>>
>> Cheers,
>> Nick.
Thanks, Alistair and Nick. ;-)
Truth is, one thing leads to another, and after a while, there's a bunch of
stuff. ;-)
All of my projects are driven by curiosity about what the real limits are
to what can be done with 1MHz Apples and ingenuity. It's a kick when I can
accomplish more than it's reasonable to expect!
A parallel Mandelbrot plotter was one of my first parallel programs, since
it is so "embarrassingly parallel". Each pixel's computation is independent
of every other, so decomposition into parallel work units is unconstrained.
I compute a whole HGR line (280 pixels) as a work unit, which takes about
2-3 minutes, so communication is a negligible part of the time, and the
speedup is linear in the number of machines.
What takes one Apple about 14 hours to compute is completed by 24 machines
in about 35 minutes.
These times are based on an Applesoft computation, since it was just
intended as a demo, but, since it spends all its time in a tight loop doing
floating-point multiplies and adds, I wouldn't expect more than a factor of
2x-3x from converting it to assembly calling ROM FP routines.
--
-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon
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| Re: 25-machine AppleCrate [message #242974 is a reply to message #242730] |
Sun, 09 February 2014 10:56 |
Aaron Daughtry
Messages: 226
Registered: July 2013
Karma: 0
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Senior Member |
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On 2014-02-08 06:59:14 +0000, Michael J. Mahon said:
> I just posted a new video to YouTube demonstrating a 25-node AppleCrate
> resulting from connecting the AppleCrate II to the AppleCrate I.
Ok, I give. There are a LOT of Michael J Mahons in the world and they
are ALL on YouTube. :-) I found some videos Sean posted a bit back
about the AppleCrate, though.
Where's the video you're referring to here?
Cheers,
m
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| Re: 25-machine AppleCrate [message #242975 is a reply to message #242974] |
Sun, 09 February 2014 11:03 |
Riccardo
Messages: 185
Registered: November 2012
Karma: 0
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Senior Member |
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Il giorno domenica 9 febbraio 2014 16:56:55 UTC+1, ultramagnus_tcv ha scritto:
> On 2014-02-08 06:59:14 +0000, Michael J. Mahon said:
>
>
>
>> I just posted a new video to YouTube demonstrating a 25-node AppleCrate
>
>> resulting from connecting the AppleCrate II to the AppleCrate I.
>
>
>
> Ok, I give. There are a LOT of Michael J Mahons in the world and they
>
> are ALL on YouTube. :-) I found some videos Sean posted a bit back
>
> about the AppleCrate, though.
>
>
>
> Where's the video you're referring to here?
>
>
>
> Cheers,
>
>
>
> m
https://www.youtube.com/watch?v=yrQJxCDrfrY
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