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Max The Magnificent
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Aluminum Memory Cards
Max The Magnificent   2/12/2014 4:54:03 PM
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Just when you think you've heard it all -- something new comes along. I must admit that I'm constantly amazed at the ingenuity of the old designers -- some of the things they came up with just blow my mind...

Paul A. Clayton
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Re: Aluminum Memory Cards
Paul A. Clayton   2/12/2014 7:17:04 PM
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I wonder what the density was compared to the core rope memory that was used for the Apollo Guidance Computer. Presumably programming a board of such memory was faster (and perhaps less error-prone) than rewiring a board of core rope memory, which would have improved debug cycle time. Perhaps such memory did not satisfy other requirements (e.g., speed), but it is also possible that the people at MIT were unaware of such alternatives. (As Seymour Cray stated: "One of the problems of being a pioneer is you always make mistakes".)

Max The Magnificent
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Re: Aluminum Memory Cards
Max The Magnificent   2/13/2014 9:25:40 AM
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@Paul: As Seymour Cray stated: "One of the problems of being a pioneer is you always make mistakes"

In that case, I must be like a one-man version of Lewis & Clark, because I've made enough mistakes to found a nation LOL

Max The Magnificent
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Zynq Design From Scratch
Max The Magnificent   2/12/2014 5:00:04 PM
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Hi Sven, I forgot to mention your new blog -- Zynq Design From Scratch



svenand
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Re: Zynq Design From Scratch
svenand   2/12/2014 5:11:05 PM
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Thanks Max, I have just started my blog about Zynq-7000 and playing with the ZedBoard. I hope to add much more information the coming weeks.

 

sixscrews
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Strowger switch invention motivation
sixscrews   2/13/2014 11:57:24 AM
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I have heard this story from other sources, and picked the following off Wikipedia:

"According to some accounts, Alman Strowger, an undertaker, was motivated to invent an automatic telephone exchange after having difficulties with the local telephone operators, one of whom was the wife of a competitor. He was said to be convinced that she, as one of the manual telephone exchange operators was sending calls "to the undertaker" to her husband."

So, perhaps a call for the dead motivated a 'live' invention...

wb/ss

David Ashton
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Re: Strowger switch invention motivation
David Ashton   2/14/2014 3:20:11 AM
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As recently as 12 years ago I lived in a small town in Zimbabwe that still had a Strowger exhange.  I did some training on them earlier in life and went into some of the larger exhanges in Harare (the capital).  The techies let me into the one in my small town a few times and it was nice hearing the rhythm of the switches again.  Mr Strowger did a good job....



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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