tailieunhanh - COMPUTER TYPES CRITERIA OF CLASSIFICATION

Transforms information about stellar and planetary positions into information about important dates and events (harvests, etc). | COMPUTER TYPES CRITERIA OF CLASSIFICATION HISTORY METHODS OF DEALING WITH DATA GENERATIONS MANUFACTURERS WIDELY ACCEPTED CLASSIFICATION TYPES OF COMPUTERS IN HISTORY Pre-mechanical computers Mechanical computers Electronic computers Optical computers Biological computers Pre-mechanical computers • an example of a computer with no moving parts • transforms information about stellar and planetary positions into information about important dates and events (harvests, etc.) Stonehenge Mechanical computers early designs for more traditional computers - based on mechanical techniques. Slide rule Abacus Electronic computers Optical computers current research in computer architecture includes much work on the design of computers which use light beams to perform computation; these machines should be smaller, faster and cooler than current electronic machines Biological computers • computers based on DNA: problems are encoded on strands of DNA which are mixed in solution and react to form DNA-coded answers COMPUTER TYPES CRITERIA OF CLASSIFICATION HISTORY TWO BASIC KINDS GENERATIONS MANUFACTURERS WIDELY ACCEPTED CLASSIFICATION ANALOG COMPUTER Analog computers measure the continuous change in something Current in a wire Movement of the tide Rate at which a wheel turns 2. More complicated to build than digital computers 3. Analog computers are very rare today DIGITAL COMPUTERS Use discrete numbers (whole digits) to control the electrical circuits Built of switches that are either on or off Can not have values in-between 0 or 1 like the analog computer 1 turns the switch on 0 turns the switch off Almost all computers built today are digital computers COMPUTER TYPES CRITERIA OF CLASSIFICATION HISTORY TWO BASIC KINDS GENERATIONS MANUFACTURERS WIDELY ACCEPTED CLASSIFICATION First Generation - Vacuum Tubes 1. From 1946 to 1956 did from 2,000 to 16,000 additions per second Had main memory 100 bytes to 2 kilobytes 2. Used vacuum tubes 3. Very large machines special rooms to house . | COMPUTER TYPES CRITERIA OF CLASSIFICATION HISTORY METHODS OF DEALING WITH DATA GENERATIONS MANUFACTURERS WIDELY ACCEPTED CLASSIFICATION TYPES OF COMPUTERS IN HISTORY Pre-mechanical computers Mechanical computers Electronic computers Optical computers Biological computers Pre-mechanical computers • an example of a computer with no moving parts • transforms information about stellar and planetary positions into information about important dates and events (harvests, etc.) Stonehenge Mechanical computers early designs for more traditional computers - based on mechanical techniques. Slide rule Abacus Electronic computers Optical computers current research in computer architecture includes much work on the design of computers which use light beams to perform computation; these machines should be smaller, faster and cooler than current electronic machines Biological computers • computers based on DNA: problems are encoded on strands of DNA which are mixed in solution and react to form .