01:198:170 Lecture Notes - Lecture 8: Program Counter, Operand

• School: Rutgers University
• Department: Computer Science
• Course: 01:198:170
• Professor: S Stoll

Document Summary

Cast of characters: processor: follows the program"s instructions, operating system: program that performs common operations, and makes your computer a useful device. Instructions: tell the processor what to do: software: programs, fetch/execute cycle: executes the instructions, memory: stores the data, hardware: the physical parts of the computer. Memory: memory stores both, the program while it is running. The data on which the program operates: addresses, finite capacity, random access memory (ram) Byte-size memory location: discrete locations: 1-byte each, address, content, one ascii characteror, a number less than 256. The fetch/execute cycle: a five-step cycle, 1. Data fetch (df) / operand fetch (of: 4. Result return (rr) / store (st: repeat (ed 7. 7 billion times per second) Machine instructions: the computer"s instructions are more primitive than what programmers type, mult 4000, 2000, 2080, commands the computer to multiply the numbers stored in memory locations 2000 and. 2080 and then store that in the memory location 4000.