Computer Science 1033A/B Lecture Notes - Lecture 3: Computer Keyboard, Clip Art, Octal

• School: Western University
• Department: Computer Science
• Course: Computer Science 1033A/B
• Professor: Laura Reid

Document Summary

Note: people remember information better when an image is presented with text. Origination of graphics: non-digital medium (paper copy of a photo) Scanner saves the image in a file on your computer: outside world - photography. Digital images uploaded to a file on your computer: create image clip art images/scenes. Computers only understand binary code (digits 0 and 1) Process of translating a piece of information (text, images, sound, video etc) into binary digits. Bit will either ha(cid:448)e a (cid:448)alue of (cid:862)(cid:1004)(cid:863) or (cid:862)(cid:1005)(cid:863) Bit is the fundamental unit of information in a computer system because: Electric signals translate into (cid:862)bit (cid:863) (cid:894)digits (cid:862)(cid:1004)(cid:863) a(cid:374)d (cid:862)(cid:1005)(cid:863)(cid:895) Conversion from analog (electric signals) to digital (binary bits) There is a chip inside the computer keyboard that stores the binary codes for all the keys that we press. After we press a key the corresponding code goes to a temporary memory called ram.