Types of computer systems transcript.docx

Types of computer systems transcript hi we\'re now going to go through some common types of computer system and do some evaluation of each of them so first of all let\'s go through some of the main most obvious types of computer systems but just to be clear a computer system is the combinatio...

Types of computer systems transcript hi we\'re now going to go through some common types of computer system and do some evaluation of each of them so first of all let\'s go through some of the main most obvious types of computer systems but just to be clear a computer system is the combination of both hardware and software and in particular the hardware which is presented to you can be in different forms so for example a desktop computer also called a tower is the big box which you\'ve got a plug-in a monitor and a keyboard and a mouse into the desktop itself is just that tower we can plug in other devices called peripherals the laptop in comparison has got the monitor and keyboard and mouse built in to its shell okay so in terms of evaluation right a laptop is portable you can take it around it\'s got a battery a desktop computer hasn\'t got a battery it\'s got to get plugged in at all times and so it\'s not nearly as portable it\'s also much physically bigger than laptop but because you can use a full size keyboard a full size mouse a full size screen often a desktop is more productive because you can do more stuff you\'ve got a bigger screen you can use a full keyboard it might speed things up it\'s what in officers usually have got desktop computers whereas maybe at home or for people who travel a laptop is a better solution and of course you\'ve also got smartphones which are computers nowadays so a smartphone is ultra portable but again having a smaller screen and no keyboard might be a limitation so you might get around that by having a tablet a tablet of course has a bigger screen than a smartphone otherwise works in a very similar way and to get around the slight issue of tablets without having keyboards and mice and so on you\'ve seen in recent years hybrid devices being put to market so for instance here is an ipad pro with a keyboard attached and also you can get a little a mouse pad as well equally some smartphones nowadays are folding so they fold out to have a bigger screen to almost make it into a tablet so you are seeing changes in order to try and you know make the devices more well-rounded i suppose okay but hopefully you\'ll be able to evaluate these in terms of how they might get used because all of these are computers but each have their own pros and cons one slight outlier in that we are not going to use ourselves necessarily as normal people are servers so a server is a powerful computer which does one job it provides a service to people like us so look at servers in future videos but often we haven\'t got much of a choice using a server the other devices usually it\'s our choice whether we want to use them or not but a computer system which we have no choice about using because it doesn\'t really exist in a usable form yet is a quantum computer so this is completely different to the other computers because it\'s still being researched and still being developed but in 10 20 50 years who knows these might be much more widely used this picture is of one by google you can see it\'s not it doesn\'t look like a computer at all now what a quantum computer does and what makes it different is it does not use standard binary logic so all of these other computers work using just binary and binary as we\'ll talk about in the future video just consists of zeros and ones so right now your computer is just using zeros **QUANTUM COMPUTERS** --------------------- and ones which is kind of crazy but actually a quantum computer does not use this system now because it\'s quantum it can be a little bit weird right quantum physics has some slightly strange behavior as you might know so a quantum computer does not use standard bits binary digits it uses instead qubits a qubit is a quantum bit and a quantum bit can be one or zero like a bit but also what is different is it can be both at the same time so inside of a computer it can be either one or zero or both is the difference in the quantum bit it\'s just how particles behave at a very very small scale very confusing it\'s quite an advanced area of physics as you probably are aware but it does enable us to massively speed up processing having the possibility to be in two places at once means you can do quite clever things and speed up processing so there are certain problems which cannot get solved using normal computers but could people think get solved using quantum computers because they work a little bit differently but because we\'re dealing with very complicated physics at a very small level these are much much harder to control it\'s nowadays quite simple to make a normal computer but much much harder to make a quantum computer haven\'t really been fully made just yet but a computer which is an action and is **MAINFRAMES** -------------- really fast is a mainframe so a mainframe is a very large powerful computer used for large scale tasks so here is a picture of a couple of mainframes this one of all right is and one by ibm ibm make quite a lot of powerful computers this costs about 100 000 pounds as far as i know some can be a lot more expensive so these are like servers but are usually even more powerful and are focused on processing so for instance a bank might buy a mainframe to do all of their transactions a supermarket might by mainframe to do all of their loyalty card information so sort of constant processing is done by a mainframe and these are really reliable the whole purpose is you can set up a mainframe and leave it for years and years and years it should just work all the time 24 7 with no issues so they\'re really reliable partly because they\'re designed with backups so inside mainframe will be lots of backups there might be multiple cpus multiple storage devices so if one fails there\'ll be a backup device to use and also there\'ll be a team of people working on them so they\'re reliable because you\'ve got people constantly fixing them and checking they\'re working and all that sort of stuff so that\'s really a downside because they are complicated and have got advanced features you do need to have a team of people helping and supporting you can leave them but you do need people to be checking they\'re working all okay so really powerful and really reliable but are complicated and are quite expensive so they can act in a very similar way to a server you could argue they are a server but most typical servers are not as powerful and do not need the level of support which a mainframe does and the final type i want to cover now **EMBEDDED SYSTEMS** -------------------- is much more going back to stuff me and you could use potentially we\'re not going to use mainframes or quantum computers in our normal lives but we might use embedded systems relatively often so an embedded system is a computer within a wider system that performs a dedicated job so let\'s break apart what that means to give you an example which i like um as an example is a hot tub so hot tub of course is just like a big bath but with fancy features you\'ve got some jets you\'ve got some maybe leds you\'ve got some uh heating as well now hot tub itself is a wider system so it\'s a system the hot tub itself is not a computer but inside the hot tub there will be a mini computer running the whole system inside the hot tub there\'ll be an embedded system the word embedded means inside something else and there\'ll be a little computer you can see the screen here running this hot tub okay so the computer does a dedicated job when a dedicated job that means it\'s doing one job and nothing else you can\'t play video games on a hot tub computer you can\'t check your emails you can\'t go on twitter it\'s doing one job and that\'s running the hot tub so usually really simple and really basic computers now nowadays often we have quite a few embedded systems even in our house and they may work together as part of something called the internet of things iot so the internet of things is the idea that many many simple embedded systems are nowadays able to connect and work together as part of a network so for instance in your house you might have a fancy toaster what a fancy microwave which is an embedded system and maybe the idea is that could connect to other devices in your kitchen so if you\'ve got a fancy kettle or a fancy oven or a fancy toaster they may communicate in some way to decide when to turn on or turn off or things like this another example might be in a car most modern cars have got lots and lots and lots of embedded systems things like managing the windscreen wipers the sat nav the headlights for brake fluid like all sorts of stuff are being managed by embedded systems again you might be able to communicate with your car from your phone from your laptop remotely through the internet that\'s the idea of the internet of things another example might be in your house a smart light bulb which again it could be part of the internet of things generally things which are called smart mean they are embedded systems and a part of the internet of things you can control the lights from your phone the lights might communicate with something like alexa some other system to work together and a fun example which is not of internet of things because most of us don\'t have planes but going back to just typical embedded systems often for computers and things like planes or other advanced machinery can be considered embedded systems you know the autopilot for example is a basic computer which can\'t do anything else all it does is make sure the plane flies and it\'s inside the plane the plane is our wider system okay so bear in mind you know embedded systems are very simple and inside other devices or other systems not always computers but they may in some cases especially inside the home work together as part of the internet of things English (auto-generated)