Computer Logic

 

 

Computer Logic

 

 

A two state device is like a switch on a wall it can be only one of 2 states on or off .

 

 



 

 

 

Binary is a number system which can be only 2 digits 0 or 1. There are also Hexadecimal and decimal.                                                      Hexadecimals:0

                                                                                            1

                                                                                            2

                                                                                            3

                                                                                            4

                                                                                            5  

                                                                                            6

                                                                                            7

                                                                                            8

                                                                                            9

                                                                                            A(10)

                                                                                            B(11)

                                                                                            C(12)
                                                                                            D(13)
                                                                                            E(14)
                                                                                            F(15)

                                                                                         

The more bits we use to represent an item of data the more different characters we can represent.

 

The bit with the smallest value is called the Least Significant Bit (LSB) and the bit with the largest value is called the most significant bi (MSB)

Characters

 

Characters are used in every day life to express information. this means that using binary code.

 

If 8 bits is used to store a character 256 characters can be stored 2⁸ =256 characters

 

Ascii (American Standard Code for Information Interchange) but this wasn't enough so now we have the unicode which allow 2^{16   combination}                                    

 

1 Bit can be either 0 or 1

A Byte is made up of 8 bits

1 kilobyte=1024 bytes

1 Megabyte=1024 kilobytes

1 Gigabyte=1024 Megabytes

1 Terabyte=1024 Gigabytes

What is an Analoge device?

An Analoge device is one in which data is represed by some quantity which is continuosly changing.

 

What is a digital device?

A digital device is a device that shows data at descrete intervals.