Exam (elaborations)
Computer Science GCSE - OCR Paper 1
- Course
- Institution
Computer Science GCSE - OCR Paper 1 Computer Science GCSE - OCR Paper 1 Computer Science GCSE - OCR Paper 1
[Show more]
Content preview
Computer Science GCSE - OCR Paper 1What makes a computer a computer? - ANS Input - Process/Storage - Output
Diagram of Von Neumann Architecture - ANS
What does HTML stand for? - ANS Hypertext Markup Language
What is the CPU made up of? - ANS Control Unit (CU)
Arithmetic Logic Unit (ALU)
Cache
Registers
What does the CU do? - ANS Tells everything else what to do
What does the ALU do? - ANS It carries out all the arithmetic and logical operations such as addition.
subtraction and logical operations
What is cache? - ANS Very Small, Very fast memory for frequently used info near the CPU
What registers are there? - ANS Accumulator (Acc)
Program Counter (PC)
Memory address register (MAR)
Memory Data Register (MDR)
What does the accumulator do? - ANS Stores intermediate results of calculations in the ALU
,What does the program counter do? - ANS Holds the memory address of the instruction for each cycle
What does the memory address register do? - ANS Holds any memory address about to be used by the
CPU
What does the memory data register do? - ANS Temporarily stores the data that has just been read from
or the data needs to be written.
What does the CPU do? - ANS processes data (fetch -> decode -> execute -> repeat)
CPU fetches next instruction from RAM, decodes it can carries it out
What is the speed of a CPU measured in - ANS Hz (or more commonly GHz)
What are the main factors effecting the speed of the CPU? - ANS - Size of the Cache
- Number of cores (programs have to be written to make use of the cores)
- The clock speed. Overclocking can be done by increasing the voltage going to the CPU
What is the purpose of an embedded system - ANS to control the device and to allow a user to interact
with it
Examples of Embedded Systems - ANS Microwave Ovens
Washer-dryers
Car dashboards
Calculators
Sat-Navs
, Digital Cameras
List the three types of storage - ANS Primary storage
Secondary Storage
Tertiary Storage
Give examples of Primary Storage - ANS RAM
ROM
Register
Cache
Give examples of Secondary Storage and what might be stored on it - ANS HDD/SSD
The OS
Programs
Data
What might tertiary Storage be for - ANS backups/archives of large amounts of data
Features of Primary Storage - ANS - ROM is read-only
- All others are volatile
- Relatively small capacity compared to secondary (GBs)
- Very Fast Access time
Features of Secondary Storage - ANS - Non-Volatile
- Much Larger Capacity (TBs)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller lectjoseph. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81989 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now