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Re: New world for hobbyists
Garcia-Lasheras   7/3/2013 6:56:09 AM
@Max: "I remember working on humongous wire-wrap prototypes ... if you messed up a connection it could take ages to track it down."

I remember that too... because I did it not so long ago!!

About three years ago, when I was working in the R&D department of an Electronic Manufacture Service provider, we used wire wrapping for building the first concept prototypes by attaching breadboards to standard development kits.

But even more interesting, the BOD --Bed Of Nails-- testers were completely customized using wire wrapping... and when systematic failure was detected, evaluating the hundreds of connections of the whole test board was a real headache!!

Max The Magnificent
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Re: Why a wrap?
Max The Magnificent   7/2/2013 3:43:36 PM
@Betajet: I don't know why you're down on wire-wrap.  It was a great technology...

I was simply teasing it in an affectionate way -- I spent countless hours creating (and debugging) wire-wrap prototypes in the 1980s and I had a lot o ffun doing so :-)

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Why a wrap?
betajet   7/2/2013 2:48:04 PM
Those SchmartBoards look pretty nice.  Now, if I can just find a compatible wire-wrap socket...

I don't know why you're down on wire-wrap.  It was a great technology, allowing easy changes to prototypes.  As long as you're careful, you can be quite accurate, though you should buzz out the board after wiring to make sure.  If you're making a big board, you need a computer-generated netlist and a fully-automated or semi-automated WW machine.

Max The Magnificent
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Re: New world for hobbyists
Max The Magnificent   7/1/2013 1:57:31 PM
@LarryM99: ...prototyping used to be done with a soldering iron...

If you were lucky! (grin) Did you ever work with wire-wrap? I remember working on humongous wire-wrap prototypes ... if you messed up a connection it could take ages to track it down.

I agre ethat the sort of things you can do today with "cheap-and-cheerful" off-the-shelf kits is incredible -- it's an exciting time, and getting more exciting by the day :-)

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New world for hobbyists
LarryM99   7/1/2013 1:12:15 PM
Max, prototyping used to be done with a soldering iron, but these days it is much more likely to be done with a C/C++ compiler. That is one of the remarkable things about Arduino and the current generation of microcontroller and sensor technology. It is certainly more exciting these days for those of us on the firmware / software side of the fence when we can buy components for pocket change that can be plugged together Lego-style and start hacking code for it almost immediately!

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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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