• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Computer Subsystems - Internal Bus Architecture

Extracts from this document...


Computer Subsystems. TASK 1 A) Internal Bus Architecture Bus Architecture is wires inside a computer where data is taken from one part of the computer to another. This bus connects all the computer components to the processor and main memory. There's also the extended bus, which connects your CD-ROM and Floppy drive to your main board. There are also expansion boards, which go into the main board called AGP, PCI, and CNR ports. These ports connect your graphics card, sound card or modem. All buses are split into two parts called the address bus and the data bus. The data bus transfers the data and the address bus tells the data where to go. The width of the bus is important because it tells you how much data can be transmitted at one time. This bus can transmit 16 or 32 bits at one time. ...read more.


Each instruction has to be fetched, interpreted and executed in turn. Immediate Access Store is basically Random Access Memory (RAM). Any program can randomly access this type of computer memory. Any byte of memory can be accessed without touching the bytes that are being used. RAM is the most common type of memory, which is found in computers and other devices such as printers. C) The Fetch - Decode - Execute Cycle. This cycle is executed when a computer program is activated; the program is a set of instructions. This set of instructions will normally be stored in the Main Memory. It is the job of the processor that controls the computer to decide what action to take with these instructions. At the beginning of a program the Program Counter is set to point at the memory location where the start of the program can be found. ...read more.


The opcode could be e.g. ADD or MOV. The Basic Function of an Operating System The Operating System is the most important program that runs on your computer. Every computer must have an operating system to run other programs. Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. The operating system has tasks like making sure data is stored in the right memory locations. The operating system acts as a translator which lets the hardware and software to talk to each other. The fetch, execute and decode cycle enables the operating system to start running a program, decode the program and execute the program. TASK 2 A) Instruction R0 R1 555 556 SWI GETINT 5 ���� ���� ���� MOV R1, R0 5 5 ���� ���� STR R1, 555 5 5 5 ���� ADD R1, R1 5 10 5 ���� STR R1, 556 5 10 5 10 HLT ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Computer Science section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Computer Science essays

  1. Peer reviewed

    Principles of Computer Networks

    3 star(s)

    This means that the message can come out of order it can also be corrupted or sections missing from the message without you knowing or noticing. UDP works at the transport layer. This protocol is as important as other protocols because the upper layer protocol has no guarantee from UDP that the message has been successfully delivery.

  2. Computer Architecture

    Instruction Register (IR) - this divides the information it receives into two fields. One field in the IR contains the operation code that tells the CPU what operation is to be carried out. The other field, called the operand field, contains the address of the data to be used by the instruction.

  1. Control Unit, Memory Unit, and Arithmetic Logic Unit. The CPU or Central Processing ...

    ROM is memory that cannot be altered. This means that even switching the computer off will not effect the contents of the ROM. There is very little that needs to be stored in ROM so it tends to be very small. This type of memory holds a special program that starts running when the computer is turned on.

  2. Fetch Decode and Execute

    This information is fetched from the register and placed in to the printable area. Decode: When the information is retrieved there needs to be some form of conversion as the fetching process retrieves ASCII, the characters representational computer form. When this is fetched it shall be decoded in to the data's true value.

  1. Smart Card System

    * Compatible with Existing Smart Card Standards - The Java Card API is compatible with formal international standards, such as, ISO7816, and industry-specific standards, such as, Europay/Master Card/Visa (EMV). 3.2. What are Smart Cards and Their Benefits? Smart cards a card similar by size to today's plastic card, that has a chip embedded on it.

  2. CP3 - Proposed Solution to a Realistic Problem - Apartment Administration software

    temp logon data to the logonfile CLOSEFILE(logonfile); // Terminate the use of the logonfile END; RESET(logonfile); // Opens the logonfile count:=0; // Set variable count to 0 WHILE NOT EOF (logonfile) DO // Check the file position BEGIN inc(count); Read(logonfile, logonlist[count]); // Count the records in the logon array from

  1. Creating a computer system for Wooten Basset Rugby Club

    * System will be run from head coach's lap top computer and therefore not need any network capabilities. * Head coach has copies of Microsoft Access already stored on his computer.

  2. Designing a computer system for the Enfield hotel.

    , for how many persons. , have you stayed here before. , tells them the price. Then if the customer is happy with the price, the following happens: * Secretary then takes down the customers, Name Contact number Credit card number This is written down in either book A1/ A2 depending on the month.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work