Robert Crawford, MBA West Middle School

 Explain how input devices are suited to certain kinds of data.  Distinguish between RAM and ROM.  Identify appropriate input devices for different types of data.

 Command  Handwriting Recognition System  Motherboard  Read Only Memory (ROM)  Speech Recognition Software  Stylus

 A computer system is a not a single part, it is a collection of working to together to do a single job.

 A computing system several, different devices that perform the four basic functions of computing...

 A computer system is a not a single part, it is a collection of working to together to do a single job.  A computing system several, different devices that perform the four basic functions of computing... ◦ What are the four basic functions of a computer?

 A computer system is a not a single part, it is a collection of working to together to do a single job.  A computing system several, different devices that perform the four basic functions of computing... ◦ Input ◦ Processing ◦ Output ◦ Storage

 Input means entering data into the computer. The most common forms of input are ◦ Text and Commands ◦ Images ◦ Sounds

 Text and Commands ◦ The most basic input device is the keyboard.  The keyboard is well suited to entering Text and commands.

 Text and Commands ◦ The most basic input device is the keyboard.  The keyboard is well suited to entering Text and commands.

 Text and Commands ◦ The most basic input device is the keyboard.  The keyboard is well suited to entering Text and commands. ◦ A command is an instruction to the computer to perform some action  E.G. the print command (Ctrl+P)

 Text and Commands ◦ The most basic input device is the keyboard.  The keyboard is well suited to entering Text and commands. ◦ There are other means of entering Text and Commands:

 Text and Commands ◦ The most basic input device is the keyboard.  The keyboard is well suited to entering Text and commands. ◦ There are other means of entering Text and Commands:  Speech Recognition Software  Handwriting Recognition Software

 Text and Commands ◦ The most basic input device is the keyboard.  The keyboard is well suited to entering Text and commands. ◦ There are other means of entering Text and Commands:  Speech Recognition Software  Normally requires a high quality microphone, or headset, and specialized software  Handwriting Recognition Software  Normally requires a specialized tablet or paper, a stylus, and specialized software

 Text and Commands ◦ There are means, other than the keyboard, for entering Text and Commands:  Speech Recognition Software  Handwriting Recognition Software ◦ Both of these input methods are often well suited to computer users with disabilities; however, they have never worked well enough for general acceptance.  At this point, several of you will point out that your phone or tablet will allow for voice and handwriting input; yet, you still use the keyboard.  What do you think some of the problems are?

 Other common text and command input devices: ◦ Mouse  All of the mouse commands can be performed from the keyboard.  Many times this faster for experienced users.  Many times this is essential for users with disabilities. ◦ Trackball ◦ Track pad ◦ Joystick

 Images ◦ Mouse ◦ Camera ◦ Drawing tablet ◦ Scanner

 Images ◦ Mouse ◦ Camera ◦ Drawing tablet ◦ Scanner  Sounds ◦ Microphones

 Images ◦ Mouse ◦ Camera ◦ Drawing tablet ◦ Scanner  Sounds ◦ Microphones  (No, not a digital voice recorder. A digital voice recorder performs all of the functions of a computer)

 The data travels from one device in the computer to another through the computers motherboard (sometimes called the mainboard). ◦ This board is covered with electrical devices and switches and it connects vital pieces such as the CPU and the memory.

 The data travels from one device in the computer to another through the computers motherboard (sometimes called the mainboard). motherboard-definition-function-diagram.html#lesson

 The CPU ◦ The main processing (calculating) device in the computer is called for CPU.  This is short of Central Processing Unit.

 The CPU ◦ The main processing (calculating) device in the computer is called for CPU.  This is short of Central Processing Unit. ◦ This is the device that converts data from input devices into a form that you can use, such as: text, sound, and pictures.

 The CPU ◦ The main processing (calculating) device in the computer is called for CPU.  This is short of Central Processing Unit. ◦ This is the device that data from input devices into a form that you can use, such as: text, sound, and pictures. ◦ CPUs’ actually cannot carry out vary many different instructions, from less than 100 in a Reduced Instruction Set Chip (RISC) to only about 1000 in the most complex

 The CPU ◦ The main processing (calculating) device in the computer is called for CPU.  This is short of Central Processing Unit. ◦ CPUs’ actually cannot carry out vary many different instructions, from less than 100 in a Reduced Instruction Set Chip (RISC) to only about 1000 in the most complex. ◦ However, programs can combine these simple instructions into a, near, infinite combination.  And, many CPUs’ can perform millions, or billions, of these instructions per second.

 The CPU ◦ The main processing (calculating) device in the computer is called for CPU.  This is short of Central Processing Unit.  View info in: Control Panel\System and Security\System

 The CPU ◦ The main processing (calculating) device in the computer is called for CPU.  This is short of Central Processing Unit.

 The CPU ◦ The main processing (calculating) device in the computer is called for CPU.  This is short of Central Processing Unit. ◦ CPU’s generate a lot of heat

 RAM ◦ The CPU temporarily stores on chips using Random Access Memory.

 RAM ◦ The CPU temporarily stores on chips using Random Access Memory.  It is important to remember that RAM requires constant power to remain active.  Once the computer is turned off, it loses all that was stored in RAM

 RAM ◦ The CPU temporarily stores on chips using Random Access Memory.  It is important to remember that RAM requires constant power to remain active.  Once the computer is turned off, it loses all that was stored in RAM ◦ Reading information from RAM is very fast. ◦ Because programs are large and complex, computers need large amounts of RAM.

 RAM ◦ The CPU temporarily stores on chips using Random Access Memory.

 A second kind of computer memory is read only memory (ROM). ◦ These chips often contain the information needed to start the computer (BIOS). ◦ These instructions do not need to be changed often and remain intact even when the power is turned off.

 Eventually, the information needs to move outside of the computer to be useful. ◦ The computer presents information using output devices.  Name some output devices.

 Eventually, the information needs to move outside of the computer to be useful. ◦ The computer presents information using output devices. ◦ When would these output devices be appropriate?  Monitor  Speakers  headphones  Printer

 In a previous lesson we talked about the difference between primary and secondary storage.

◦ Tell me about the difference.

 In a previous lesson we talked about the difference between primary and secondary storage. ◦ Primary memory is closer to the processor.  It is Faster  It is more expensive

 In a previous lesson we talked about the difference between primary and secondary storage. ◦ Secondary memory is further from the processor.  It is slower  It is less expensive  Longer lasting

 In a previous lesson we talked about the difference between primary and secondary storage. ◦ We are adding one more

 In a previous lesson we talked about the difference between primary and secondary storage. ◦ We are adding one more:  Primary  Secondary  Off-Line

 Explain how input devices are suited to certain kinds of data.  Distinguish between RAM and ROM.  Identify appropriate input devices for different types of data.

 Key terms ◦ Command ◦ Handwriting Recognition System ◦ Motherboard ◦ Read Only Memory (ROM) ◦ Speech Recognition Software ◦ Stylus

 Make a chart comparing, and contrasting, RAM and ROM