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QUESTION: hi,

how exactly is data created and then sent through a cable?  we all know how it works, for e.g. you press a key on the keyboard and then it touches a circuit board and then goes through the wire, but how was this created?  do you know what i mean?  i can't find this info on the internet and i don't know how to pose the question.

thanks,

sk

ANSWER: Good question.  And, there are many good answers.  But over the years standards of code generation have been developed and agreed to by the manufacturers, software writers and code uniformity organizations. Essentially, there are codes associated with each key. These codes go to the cpu (central processing unit(s)) that translate those codes into action commands which prepare further data instruction to send these accumulated codes to the Internet through the interface system.  Here are some Internet pages to take a look at; they will give you more detail about the process.

http://philipstorr.id.au/pcbook/book3/keyboard.htm

http://www.win.tue.nl/~aeb/linux/kbd/scancodes-1.html

http://retired.beyondlogic.org/keyboard/keybrd.htm

https://en.wikipedia.org/wiki/Computer_keyboard

https://en.wikipedia.org/wiki/Scancode

http://www.quadibloc.com/comp/scan.htm

Sorry to say, from the pages above, it is somewhat grotesquely complicated and my apologies for giving you such a long reading assignment.

Hopefully you can scan through the pages and get some idea of how the keyboard works as an input device to command the computer as it connects to the Internet.

Then, if you are still mystified, please compose more questions and send a follow up.

Cheers.



---------- FOLLOW-UP ----------

QUESTION: thanks for the links.

but i was going for something more low level?  is that the right word?  

for e.g. a processor is a piece of metal.  how does information/data/instructions or whatever you wanna call it go onto a piece of metal?  it's a piece of metal for crying out loud!  how do letters and words go onto this thing?  i cannot wrap my head around this.  do you know what i'm trying to get at?  if you have a link for that, i would love to read about it.

thanks,

sk

Answer
In the previous question you were highlighting the keyboard.

Now, with the "metal" emphasis I assume you might be inquiring about the processor or Integrated Circuit which is embedded on a metal substrate.

http://www.madehow.com/Volume-2/Integrated-Circuit.html

Above is a lecture on how they are made.  There are other places to get basic information as well, such as wikipedia.

https://en.wikipedia.org/wiki/Integrated_circuit

The above is a good reference on the basics of IC technology - in simple terms.

You might want to look at the basic transistor - which is the beginning of the digital world.  After all the IC (or piece of metal as you like to call it) is a package of hundreds or even thousands of transistors all formed on one metal substrate to complete electronic circuitry.

You can find basic information about silicon or germanium transistors with a simple search on google or bing.

Summarizing, the "piece of metal" is if looked at with a high power microscope a maze of electrical circuits which are composed in a way to receive electronic signals and perform computer operations defined by software which is embedded into an operating system capable of receiving formated code structures in performing the computing operations demanded by inputs from the keyboard, mouse or other input signals.

Try googling some of the basic terms and you will find large amounts of information suited to your own interest and level of understanding.

Let me know if you need more guidance; trying to focus on the level of inquiry you are pursuing.  

May I also suggest, with your interest level, pursuing a course in digital electronics which courses can be found online and at most high schools, colleges and universities as well as private schools that offer many programs in this area.

Hope this helps.  

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Electronics questions about AC, DC and digital theory.

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Graduate electrical engineer with over 40 years in electronic design, manufacturing, project organization and patent review. Experience in fields of industrial and consumer electronics (audio, video, acoustics, etc.)

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IEEE (Institute of Electrical and Electronics Engineers); Senior Life member AES (Audio Engineering Society), Fellow Life member

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BSEE University of North Dakota

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