I learned in lesson 3 that to take care of our computers we must: 1. Place them in a cool and dry place. 2. Tie together all cables/connectors to avoid accidents. 3. Refrain eating in front of the computer because it may attract bugs that can cause malfunctioning or you may spill your drink that can cause malfunctioning. 4. Always use an AVR(automatic voltage regulator) to regulate the electricity. 5. Not bump or drop computer peripherals/components. 6. Avoid clutter around computer. 7. Always scan for viruses. I also learned that there are good working habits for the computers like: 1. Tapping the mouse buttons gently. 2. Avoiding long, uninterrupted periods of typing. 3. Avoiding staring at the monitor for long periods.
There are also proper workstation designs
positioning in a well-ventilated, comfortable room.
using an adjustable workstation.
placing the monitor 16 to 24 inches away, at eye level.
using extendable/retractable legs
placing the mouse where it really is easily accessible by your dominant hand.
using document holders to minimize vertical head movements.
Proper postures :D
Sitting up straight and feet are flat on the floor.
Positioning your lower arms parallel with the floor and leveling it to your keyboard.
Hamster: "This lively pet hamster will keep you company throughout the day. Watch him run on his wheel, drink water, and eat the food you feed him by clicking your mouse. Click the center of the wheel to make him get back on it."
Charles Babbage produced a design for a mechanical computation engine back in the nineteenth century.The precision he demanded of the engineering was not possible at the time so it was not completed.Modern computing involves electronic circuits of one kind or another. Blaise Pascal, a French Mathematician, produced an idea for a digital computer at about the same time.
An electromechanical machine called Collossus was used in the Second World War to crack the Enigma encryption codes used by the German Army.It was so good that it could crack Enigma codes faster than a modern PC with a Pentium processor
The earliest fully electronic computer was built by the US Navy during the Second World War under the supervision of Grace Hopper.It was she who coined the phrase “bug” for a program error, when a moth shorted out a couple of wires.It was she who invented the first computing language, ATP, and she verified the language COBOL which was widely used in industry.She was at the forefront of computer development.As an officer of the Naval Reserve, she achieved the rank of Admiral.
All these early machines were huge, needed large amounts of electricity to keep them going, and specialised people to run them, and interpret the output.Programming them was difficult as they needed to use machine code, the series of 1’s and 0’s that the computer uses.Finding errors was time consuming and difficult.
An American company, International Business Machines, was one of the first to go into commercial production of computers.Its Chairman was famously quoted that he reckoned that there was a market for four or five of these machines worldwide.The main problem was that these machines used thermionic valves (“toobs”) in their electronics.They used a vast amount of electricity and were none too reliable.
Question 13 Explain why computers were not widespread in the nineteen-fifties. ANSWER
When the transistor was invented and perfected in the mid nineteen-fifties, the complex circuitry within a computer could be made into a manageable size.Contrary to expectations, the computer rapidly became a “must have” for large corporations.These were vast machines called mainframes which needed large buildings and a good number of specialised staff to operate them.COBOL (Common Business Oriented Language) was a common language used by these machines, along with the EBCDIC character codes. The picture shows a mainframe:
Mainframes are still in use in some corporations because of the huge sums of money invested.However many mainframes have less computing power than PCs and only survive due to the economics.
Mini-computers are smaller versions of mainframes.Some of these were based on the analogue concept, in which the operational amplifier was at the heart.Analogue computing is almost completely unknown nowadays.
The microcomputer is the generic name for a number of different kinds of small computer, of which the most common is now the PC.When microcomputers came in, in the late seventies, they had taken advantage of the rapidly falling price of integrated circuit chips.Some of these were designed at the home market.Examples include the Sinclair Spectrum, and the Amiga.
The British Broadcasting Corporation sponsored the design of a microcomputer which became very common in schools. The picture below shows a BBC microcomputer.
These machines had a very simple operating system, and were easy to run.Many people used them to write their own software; there was little commercially available software.A number of teenagers made a lot of money by producing software in their bedrooms.
The graphics were crude, and there was little memory.Auxiliary storage was on 5 inch floppy disks that were even cruder than present floppy disk.Some programs were even recoded on audio cassette.Sometimes the programs were broadcast on the radio.The transmission sounded like a nest of angry bees.Some software was available on pre-programmed chip.Access to these was remarkably easy.For Interword, a word processor, you typed “*IW.”.The BBC was very good at:
Data-logging
Word-processing
Spreadsheets
The old BBCs were very reliable.If the programs did go wrong, the computer could be restored by pressing the BREAK key, and the program could be reloaded by pressing SHIFT + BREAK.BBC computers still are in use in some schools. The BBC was overtaken bythe Archimedes which, in its later versions could be configured to run like a PC.
dinala sa ospital ung dad nung isang Idiot xDD tapos ayos lang nmn daw ung kalagayan sabe ng doctor tapos nagkadevelopan c Rasho key ate etoh oh video patunay nun ^_^
yan tapos grumaduate na cla tapos ung friends ni rasho after ng graduation hinanap cia tapos nalaman nila na hndi pla tlga cia c rasho cia ung isang anak ng gardener ng totoong rasho ... END
