Computing A Level

Computing A Level

1. Year 2

2. Year 1

   • Theory
     • 1.1.1 Structure and Function of the CPU
       • Architecture
         • Von Neumann
           • Address and Data stored together
             • Slightly slower as need seperate cycles for instruction and data
         • Harvard
           • Separate storage for address and data
             • Speeds up FDE cycle
             • 2 Buses means more expensive and more complicated design
             • Can waste storage space
         • Contempory
           • Cross between Von Neumann and Harvard
       • Components
     • 1.4.1 Data Types
       • Character Encoding Using ASCII and Unicode
         • ASCII
           • Pros
           • Cons
             • Doesn't allow for other characters
         • Unicode
           • Pros
             • Allows for languages that do not use the English Alphabet Eg Arabic, Hebrew and Mandarin
             • The first Byte is reserved for ASCII so that any ASCII characters can be read in Unicode without any changes
           • Cons
             • Unicode uses a lot more bytes per character and therefore creates a lot larger file size
         • How it Works
   • Coding