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Michael Dunn
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Gap
Michael Dunn   11/14/2013 4:03:48 PM
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I might have filled in a bit between vacuum tube flip-flops and DRAM...  ;-)

JeremySCook
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Re: Gap
JeremySCook   11/14/2013 5:40:47 PM
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Yeah, you're probably right.  I had a few other items I decided to get rid of because they didn't really fit in, but a couple substitutes could have been good.

DrFPGA
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Re: Gap
DrFPGA   11/15/2013 11:03:52 AM
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Seems like mag tape got missed too...

BrainiacV
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What are them thar mebibits?
BrainiacV   11/15/2013 3:34:00 PM
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"MT4C1024 one-mebibit dynamic random access memory (DRAM)"

megabit?

And to explain the title, a coworker and I had a 20 minute argument with a hardware manager about the execution of our program. We assured him the program would execute within the 77 millisecond window between interrupts and he argued that our program could not be that fast.

At the end of it he asked, "What are them thar milli-seconds?"

We don't expect the body to be found.

JeremySCook
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Re: What are them thar mebibits?
JeremySCook   11/15/2013 4:42:48 PM
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Mebibit's are bits that you actually own, rather than are owned by the company that you work for...  Seriously though, thanks for pointing this out.

junko.yoshida
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cool slideshow
junko.yoshida   11/15/2013 7:12:11 PM
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this is a cool slideshow that takes us on the journey of electronics history...

David Ashton
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Re: Gap
David Ashton   11/16/2013 4:05:03 AM
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....and ferrite core ram....

DrQuine
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Data Access and Longevity
DrQuine   11/16/2013 8:29:17 PM
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A key parameter that isn't discussed is the likely life expectancy of the stored data. Clearly #1 (stone) wins hand down.  It is still accessible thousands of years later without special instrumentation. The next step (which wasn't shown) is paper. It also can be read thousands of years later without special instrumentation. After that the story is much less encouraging. By my best guess, 5 of the memory technologies fail in archival storage because they lose memory without power (#3, 4, 5, 12, 14). Five more are no longer accessible because the technologies have been retired (#2, 6, 7, 8, 13). That leaves 4 to consider: the hard disk drive (9), the CD (10), and the flash (11) USB thumb drive (15). Today they seem safe - but it wasn't long ago that IBM cards, magnetic tapes, 8" floppies, 5.25" floppies, 3.5" floppies were considered universibly accessible.  Most modern home computers can access none of them without special adapters. Powering and interfacing to old disk drives can be a challenge. From our present vantage point CD's seem universal but there are reports that the data may have a life expectance of less than 10 years. Also the availability of readers seems to be waning in newer devices. USB thumbdrives are certainly the current fad - but I have no doubt that the next technical wave will sweep them away as well. For the time being for archival storage, our two choices are paper (I'll concede the low data density of stone makes it impractical) and aggressive backup on electronic media that is constantly rolling the data (and the reading tools)to current storage technologies and equipment. A high overhead process. Our ancestors did much better with archival storage than we're managing.

JoeAB
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Re: Gap
JoeAB   11/16/2013 8:37:51 PM
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My first supervisor showed a design from around 1961. Each bit was made of transistors and passives encased in a 1 x 1 x 1 cm block of plastic.

David Ashton
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Re: Data Access and Longevity
David Ashton   11/16/2013 9:11:59 PM
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@DrQuine.  What you're saying is that as we go on we are getting more, but shorter term, memory.  Sound's like Altzheimers to me......

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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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