Crash Course Computer Science #23 - Screens & 2D Graphics

What were early computer screens used for?

• typing commands into the computer

• keeping track of a program's operations

• providing visual confirmation of calculations

• eliminating the need to have computers and its peripherals separate

The earliest and most influential display technology

• cathode ray tubes

• LED screens

• glass monitors

• plastic terminals

What are the two ways to draw graphics with CRTs?

• vector scanning

• raster scanning

• grid scanning

• light node scanning

Modern __ also use raster scanning, but for colored pixels instead.

• LED screens

• liquid crystal displays

• plasma displays

• CRTs

Why didn't early screens use pixels?

• They couldn't - the technology was too advanced

• It was low quality, and images often hard to read

• Too expensive to manufacture

• It took up too much memory

What were the first graphics cards, used to read characters and convert into raster graphics?

• RAM modules

• ASCII reader

• character generator

• integrated circuits

The character generator would use the __ from the computer's memory.

• character bank

• screen buffer

• text library

• ASCII databank

Character generators were a clever way to save ​ (a)   , but they didn't provide any way to draw arbitrary ​ (b)   .

• memory
• shapes

Vector mode on CRTs eliminated the ASCII limits by creating all visual displays with

• pixels

• points

• lines

• text

Vector graphics use a __ to generate designs.

• grid

• table

• circle

• 3D plane