11101110 ----> 238 - ✔✔Converting From Binary To Denary
107 ----> 01101011 - ✔✔Converting From Denary To Binary
1 Kilobyte - ✔✔Number Of Bits: 2¹⁰
Denary Value: 1 024 bytes
1 Megabyte - ✔✔Number Of Bits: 2²⁰
Denary
...
11101110 ----> 238 - ✔✔Converting From Binary To Denary
107 ----> 01101011 - ✔✔Converting From Denary To Binary
1 Kilobyte - ✔✔Number Of Bits: 2¹⁰
Denary Value: 1 024 bytes
1 Megabyte - ✔✔Number Of Bits: 2²⁰
Denary Value: 1 048 576 bytes
1 Gigabyte - ✔✔Number Of Bits: 2³⁰
Denary Value: 1 073 741 824
1 Terabyte - ✔✔Number Of Bits: 2⁴⁰
Denary Value: 1 099 511 627 776
1 Petabyte - ✔✔Number Of Bits: 2⁵⁰
Denary Value: 1 125 899 906 842 624
101111100001 ---> 1011 1110 001
B E 1
1000011111101 --> Add 2 0's = 0010 0001 1111 11012 1 F D - ✔✔Converting From Binary To Hexadecimal
4 5 A ---> 0100 0101 1010 --> 010001011010 - ✔✔Converting From Hexadecimal To Binary
Use Of Hexadecimal System - ✔✔- Memory dumps
- HTML (HyperText Mark-Up Language)
- MAC (Media Access Control)
Memory Dumps - ✔✔Often used when developing new software or when trying to trace errors in
programs. The contents of part of the computer memory can hold the key to help solve many problems.
HyperText Mark-up Language (HTML) - ✔✔Used when writing and developing web pages. HTML isn't a
program language but is simply a mark-up language. A mark-up language is used in the processing,
definition and presentation of text.
Media Access Control (MAC) - ✔✔Refers to a number which uniquely identifies a device on the internet.
The MAC address refers to the network interface card which is part of the device.
Universally Administrated MAC Address (UAA) - ✔✔Most common type of MAC address, set by the
manufacturer at the factory. It is rare for a user to want to change this MAC address
Web Addresses - ✔✔Each character on a keyboard has what is know as a ASCII code (American Standard
Code For Information Exchange)
Data Transmission - ✔✔Data transmission can be either over long or short distances, three factors need
to be considered when transmitting data.
- Direction of transmission (One or both directions)
- Method of transmission (How many bits sent at the same time)
- Method of synchronisation between two devices
Simplex Data Transmission - ✔✔- One direction only- From sender to receiver (Computer to printer)
Half Duplex Data Transmission - ✔✔- Both directions but not at the same time
- A -> B or B -> A along same line (Phone conversation)
Full Duplex Data Transmission - ✔✔- Both directions simultaneously at the same time
- A -> B or B -> along same line (Broadband connection on phone line)
Serial Data Transmission - ✔✔When data is sent (One bit at a time, over a single wire or channel. (Bits
are send one after another in a single stream)
- Works well over long distances
- Data transmitted at slow rate -> compare to serial transmission
- No problem of data arriving at its destination out of synchronisation
Parallel Data Transmission - ✔✔Several bits of data (Usually 1 byte) sent down several wires or channels
at the same time, one wire or channel is used to transmit each bit
- Works well over short distances
- Bits can become 'skewed' no longer synchronised
- Faster than serial
Asynchronous Data Transmission - ✔✔Data being transmitted in a agreed bit pattern. Data bits (1s & 0s)
are grouped together and sent with control bits:
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