1. CPSC 2031 What is a computer? A machine that processes information

2. CPSC 2032 Processes Information Input ComputerOutput … but, brains process information

3. CPSC 2033 Why use computers?  Fast  Accurate  Don’t get bored  Expand our capabilities

4. CPSC 2034 At fundamental level  Computers work by transmitting an electric current through switches

5. CPSC 2035 Components Calculator Computer

6. CPSC 2036 Input devices

7. CPSC 2037 Output Devices

8. CPSC 2038 Temporary Memory Calculator  Small  Intermediate values  Explicit memory Computer  Bigger  Main memory Power off Information lost

9. CPSC 2039 Storage Calculator  none Computer Big external storage  Floppy disks  Hard disks  Optical disks  Magnetic tape  Flash memory

10. CPSC 20310 Processor Calculator  Single purpose  Few functions  Hardwired Computer GGeneral purpose PProgrammable

11. CPSC 20311 Processor  Performs (executes, carries out) a sequence of instructions

12. CPSC 20312 What instructions  Arithmetic: + - * /  Compare 2 data values and use the result to alter the order of execution  Move data (e.g. from memory to processor)

13. CPSC 20313  Program: A sequence of instructions  Stored program computer: processor gets the data AND the instructions from main memory

14. CPSC 20314 Summary Computer  Programmable  More I/O options  Bigger memory  Storage  Faster  Stores both programs and data in memory

15. CPSC 20315  See overhead