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Monthly Archives: October 2011

Binary- Whait is it and why do computers use it?

In everyday life, we use 10 decimal numbers to represent numerical data,
BUT
Computers cant do that. The lowest base number system we can use is 2 so instead, computers use this to represent numbers. This is the binary system. As computers use voltages, there is not a specific voltage for each number in the decimal system because voltages change constantly. Therefore it is measured as a two state system, either on or off. Computers also use the binary system to keep things simple, such as calculations. If we used the decimal system, 100 rules would have have to be wired into the computer, whereas in the binary system there would only be 4 rules for calculations. Finally the last main reason why computers are two state systems and use binary is that the magnetic and optical storage devices used are suited best to two state systems.

How to convert (decimal -> binary)

In the decimal system the number 34567 could be represented as

10^4       10^3       10^2       10^1    10^0

3            4            5            6         7

In binary the number 11001 could be written as:

2^4         2^3         2^2         2^1         2^0

1            1            0            0            1

OR

16           8              4              2              1

1             1              0              0              1

To convert binary numbers to decimal (1 byte):

The term bit is short for binary digit.

so 8 bits make up 1 byte.

The byte is 10010111

128         64           32           16           8              4              2              1

1              0            0              1           0              1              1              1

To work this out, you multiply the numbers which are a 1 by 1 and add them together to give you the decimal number

= (128×1) + (16×1) + (4×1) + (2×1) +(1×1)

= 128 + 16 + 4 + 2 + 1

= 151

How to convert (decimal -> binary)

Convert the number 98 into binary:

To do this, does the number go into 128? no. so this becomes a 0.

Does it go into 64? yes, so this becomes a 1.

Does the remaining 34 go into 32? Yes so this is also a 1

Does the remaining 2 go in 16, 8,  4, or 1? No so these are all 0’s.

Does the remaining 2 go into 2? Yes, so this is a 1.

128       64       32       16       8       4       2       1

0          1          1         0        0       0       1       0

98 in binary = 01100010

The largest number we can make with 1 byte is 255. so if we wanted to make a number which is larger, we’d just add another byte on.

Units of Measurement:

1 byte (8 bits) – used to store binary numbers.

1 Kilobyte (1024 bytes) – A very very short story

1 Megabyte (1024 Kilobytes) – 1 minute of MP3 compressed music.

1 Gigabyte (1024 Megabytes) – A DVD-R can hold about 4.7 GB.

1 Terabyte (1024 Gigabytes) – becoming more common as the standard size of hard drive on a computer.

 
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Posted by on October 29, 2011 in Computing

 

Steve Jobs- a true visionary

Yesterday, Apple announced in a statement that former CEO Steve Jobs tragically lost his fight to Pancreatic cancer at the age of 56. He was a great visionary to the world and we have lost a genius. In 1976 Steve co-founded Apple Inc and it has developed into the largest Multinational computing technology company.

After founding Apple in 1976 he then resigned from Apple and founded NeXT, a computer platform aimed at business markets. Soon after, he bought a share of Lucasfilm Ltd which is better known as PIXAR studios. He then returned to Apple in 2000. Which saw saw the release of the iMac,iPod -1st, 2nd, 3rd, 4th, touch, MacBooks – Air. And Finally, the Generation of iPhones. All of these products were designed and created under the watchful, creative eye of Mr Jobs, as he did approve and in most cases help create Apple products.

In August 2011, Jobs resigned from Apple as his illness started to take over. It was Jobs’ ambition to stay CEO for as long as he possibly could, but the time eventually came:

“I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple’s CEO, I would be the first to let you know. Unfortunately, that day has come.” – Steve Jobs

If it wasn’t for Steve Jobs founding Apple Inc. Would the worlds technology be advancing at the pace at it is?

R.I.P Steve, you are a true visionary, and a tremendous human being.

Apple

 
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Posted by on October 7, 2011 in Computing