Part 1
Sales Assistant: Good afternoon, sir. Can I be of assistance?
Dave: Yeah, I’m looking for a new phone; it seems my current one is kaput.
Sales Assistant: OK. What sort of price range are you looking at? And any particular make or model?
Dave: Something between 50 and a hundred. The make doesn’t matter.
Sales Assistant: Right, well we have this one for ₤59.99. It has touchscreen technology, a keyboard, wi-fi, bluetooth, and the usual range of apps: music player, voice recognition, games, office, etcetera.
Dave: Does it come in a different colour? I’m not keen on the white.
Sales Assistant: Yep, we also have it in silver, black, or sky blue.
Dave: Hmm, I don’t know. It’s a bit bulky. Do you have anything lighter and slimmer?
Sales Assistant: Of course, although the lighter models tend to cost more. Let me show you what else we have in stock…
Part 2
Philip: Excuse me, I’m wondering if you could help me. I’m looking to buy my girlfriend a laptop for her birthday, but I’m not particularly technologically-minded.
Sales Assistant: OK. Well, the first question is: what does she need it for? Work? Games?
Philip: She’s not much of a gamer, but she’ll need to write documents, make presentations, that sort of thing. It shouldn’t weigh too much either, since she needs to lug it with her on the morning commute.
Sales Assistant: I see. Well, you basically have a choice: price vs. performance. If she is just using it for work, surfing the net, and a bit of social networking, she won’t need anything too powerful or with a lot of memory. Something simple should suffice.
Philip: Will I need to buy any accessories?
Sales Assistant: Up to you. A lot of people like to add speakers and a webcam, and an external hard drive and optic mouse can be quite handy, but none of them are necessary.
Philip: How about software?
Sales Assistant: The basics are all pre-installed, but I can chuck on a few other programmes if you’d like. I’ll give you a USB as well, so that you can keep the directory and desktop free of clutter. Anyway, let me show you what we have, and you can take them for a test drive.
Part 3
Nearly everyone knows the basics of operating a computer, and using a touchscreen could not be easier, yet very few people know how the central processing units inside a computer work, the processes involved in turning raw materials into these functional units, or how these processors can work just on the movements of your fingers.
In 2009 Intel published a page on its website showing how sand is turned into a CPU. This walk-through, using pictures, videos, and text, illustrates that there are actually many highly-technical and complex steps in the production process, from purification and melting of the sand into silicon ingots, through the treatment and etching of thinly-sliced segments, to the placement of conducting copper ions on the surface, before the final chip is ready for testing. The creation of these computer chips in the 1970s was truly a revolutionary technology.
The technology behind touchscreens is also generally taken for granted these days. To understand how these work, first one should be aware of how a basic keyboard works: two electrically conducting sheets are separated by a non-conducting membrane, the latter of which has holes in it, one for every key. As a key strikes down, it pushes the top conducting sheet through the hole, completing the circuit at a particular point and thus telling the computer what to do. The first touchscreens used the exact same process, only with invisible sheets placed over the screen.
Touchscreens have moved on, however, and many now operate not by having the user complete the circuit, but by disrupting it. The screen is now a permanently operating circuit – either an electric field, grid of infrared beams, or even bouncing sound waves – and as an object (such as a finger) is placed in the circuit, the processor knows where the disruption is taking place and responds accordingly. The swapping to this new model allows the screen to be manipulated in multiple areas at the same time, greatly increasing the interactive potential.
*Intel page: http://newsroom.intel.com/docs/DOC-2476
*A simplified version: http://www.geek.com/articles/chips/from-sand-to-hand-how-a-cpu-is-made-2009079/
*How touchscreens work: http://www.explainthatstuff.com/touchscreens.html