prelim 2 edited review guide - Business Computing Review...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Business Computing Review Hardware What is a platform? -facebook, internet explorer, Apps, etc Stored program concept John Von Neumann Digital computer: structure o Input/output sent to primary storage o Primary storage/ secondary storage The motherboard where the CPU resides, the heart of the computer o It serves as a skeleton o Transmits signals Microprocessor: CPU o Central processing unit o Control unit AND arithmetic logic unit (these are two separate units but together are CPU) o Like the brain of the computer, processes the information Which is both an input and an output device? a. Bar code reader b. B. flat bed scanner c. Touch screen d. Sensor e. Plotter Primary v Secondary Storage o Primary: where everything is temporary, volatile, if you press reboot button this goes away, anything you are working on at that moment Is in the “box” desk top computer o Secondary: stuff that stays around when you unplug the computer Can be in the “box” Can also be flashdrives, any kind of magnetic optical media Non volatile memory Memory in Use o When you open up a document it transfers from secondary to primary storage The system clock o Pumps life through the body o FETCH DECODE EXECUTE… system clock determines how fast computer works One megabyte = 1 million bytes! Input devices: capture input (keyboard, mouse, microphone, camera, webcam, scanner Output devices: produce sound or graphics (monitors, speakers) Memory o RAM, ROM, Disks o What is memory? o How much is a byte?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Business Computing Review 0.1 bytes 1 byte (one character) 2 bytes 10 bytes (one word) 100 bytes (telegram o Kilobyte 1000 bytes 100K = photographs; 200K – two boxes punched computer cards o 1 megabyte = 1 million bytes 1M = small novel 2 mb= photograph, high resolution o 1 GB- 1,000,000,000 bytes Paper in the bed of a pickup o Terabyte = 10^12 bytes o Petabyte = 10^15 200 petabytes = all printed material that exists in print A petabyte is a LOT of information Hard disk drives have the disadvantage that: a. They hold less info than disketts b. They are more likely to fail than other computer components c. Cannot be backed up d. Their contents are lost if they lose power e. All of the above Error Checking: Even Parity don’t understand o Even and odd parity o If you want to save a byte- the way parity works is that one bit at the end of a byte is the parity bit o With even parity you must have an even number of ones Binary Math: Addition Facts o Everything a computer does gets broken down into tiny steps are 1’s and 0’s o Very simple 0 + 0 = 0 1 + 0 = 1 0 + 1 = 1 1 + 1 = 10 00111010 + 00011011 = 01010101 00001111 10011010 10011010 AND 10101010 OR 11001001 XOR 11001001 = 00001010 = 11011011 01010011 1= true 0= false so think about adding like that iClicker question 10010100 AND 01101110
Background image of page 2
Business Computing Review = 00000100 Processors o Have a very small command set (can do things like add, AND, XOR, etc)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

prelim 2 edited review guide - Business Computing Review...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online