Information Technology Concepts. Hardware: Input, Processing and Output. Hardware Components. Central Processing Unit Primary Storage (main memory; memory) Secondary Storage Input Devices Output Devices. Hardware Components. Hardware Components. Control Unit
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Hardware: Input, Processing and Output
In the instruction phase, the computer’s control unit fetches the instruction to be executed from memory.
Then the instruction is decoded so the central processor can understand what is to be done.
Step 1 & 2 are called the instruction phase, and the time is takes to perform this phase is called the INSTRUCTION TIME (I-time).
In the execution phase, the ALU does what it is instructed to do, making either an arithmetic computation or a logical comparison.
Then the results are stored in the registers or in memory
Step 3 & 4 are called the execution phase. The time it takes to complete the execution phase is called the EXECUTION TIME (E-time).
Magnetic Tapes and Disks, Optical Disks, and CD-ROMs, and DVD’s are used to store data for easy retrieval at a later date.
Uses laser beam technology to read and write.
Comparison of methods of secondary storage
Virtual Laser Keyboard
E.g., mouse, light pen, touch pad, touch screen, joystick, and eye-tracking device
Scanning Devices (Entering Batch Data)
Audio - sound that has been digitized
Magnetic Ink Character Recognition (MICR) Device
Type of notebook that accepts input from an electronic pen