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Summary Grade 11 Information Technology (IT) Theory Notes | Full Year R120,00
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Summary Grade 11 Information Technology (IT) Theory Notes | Full Year
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This document has almost everything covered in the IEB java Grade 11 IT Theory curriculum, included in the document is pictures and detailed descriptions of terminologies and how things work. The only thing left out is Chapter 7, as chapter 7 is merely general knowledge of Computers and components.

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  • 1 to chapter 6
  • November 2, 2023
  • 21
  • 2022/2023
  • Summary

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11/7/22, 2:52 PM IT THEORY NOTES - FULL YEAR




IT THEORY NOTES - FULL YEAR
UNIT 1: DATA REPRESENTATION AND BOOLEAN LOGIC


Word Size: the number of bits a CPU can process at once


Buses: Either built with 32 bit (4 bytes) or 64bit (8 bytes)


Binary
0 represents off
1 represents on
usually grouped together in multiples of 8 in registers of buses


Eg) 2 x 2 x 2 = 2^3 = 8


Binary addition
0 0 1
+ 0 + 1 + 0
-----------------------
= 0 1 1




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,11/7/22, 2:52 PM IT THEORY NOTES - FULL YEAR




NOTE: if you see something where it is 1 + 1 + 1, it is equal to 1.


Unsigned bits:
smallest number - 0
largest number - 2^n-1

In positive numbers, we ad 0's to the front of the binary to complete the multiple of 8
Eg) 9 = 10012
therefore, 9 = 000010012

In negative numbers, we use the first most left binary value to indicate negative
Eg) 9 = 10012
= 000010012
therefore, = 100010012 = -9

Two's complement
Represent -47 in 8 bits with two's complement
you need:




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, 11/7/22, 2:52 PM IT THEORY NOTES - FULL YEAR




the number itself
number of bits
representation code (sign and size or two's complement)

-47 = -101111
= - 00101111 (multiple of 8)
= -00101111
= 11010000 (drop the minus and swap the 0s and 1s, this is ones complement)


11010000
+ 1
= 11010001 (two's complement)




Replacing binary with hexadecimal




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