ST1 REVISION

ST1 REVISION

1. Computer Systems

   • CPU
     • arithmetic logic unit (ALU)
     • CPU also known as processor
     • Fetch Cycle
     • Switches on and off
   • RAM
     • Fetch Cycle

2. Binary

   • 128 64 32 16 8 4 1
   • 1= true 0=false
   • Hexadecimals
     • Each hex digit reflects a 4-bit binary sequence.
     • 11010100 in binary would be D4 in hex
     • Hexadecimal (or hex) is a base 16 system used to simplify how binary

3. Algorithms

   • Flowcharts
     • A flowchart is a diagram that depicts a process, system or computer algorithm
     • Terminal/Terminator
     • Process
     • Decision
     • Data, or Input/Output
     • Flow Arrow

4. Secondary Storage

   • Hard Drive
   • Laser Disk
   • USB Drive
   • Tape Drives