Name: Unit 1 – Data Representation Define and Explain
Binary o Computer is a two state machine, binary Is a two state counting system o Fewer rules of addition o Easy to represent states in memory o Not affected by voltage degradation Representing Binary Numbers o Convert binary to decimal o Convert decimal to binary Two’s Compliment Conversion o Converting negative numbers from binary to decimal and visa versa o Convert number to binary, invert, add one Floating Point Representation o Mantissa o Represents the actual number o Increasing bits increases accuracy o Exponent o How many places to move decimal o Increasing bits increases range Memory Sizes o Bit (divide by 8) o Byte (divide by 1024) o Kilobyte o Megabyte o Gigabyte o Terabyte ASCII o 7 bits 256 characters o Character Set are all the characters Which can be represented o Control Characters control print head
How confident am I?
√ = very ?= unsure X = do Not understand
Non-printable characters o Requires less memory than UNICODE UNICODE o 16 bit capable of representing all languages o first 128 codes represent ASCII making it easy to convert Bitmap o Stores the colours of each individual Pixel o Increasing the bit depth increases the Memory size requirements o Adding more objects does not affect memory requirements o Can edit individual pixels o Saves the full screen Vector Graphics o Stores the attributes of objects making Up images o Adding more objects increases the Memory requirements o Resolution independence prints at full Capability of printer Mark in how well you think you are coping with each section Discuss any areas which are problematic with your teacher Read up on these sections FIRST when you are studying!