Computer Architecture II

I. Input Device

Input devices are divided into two groups, namely direct and indirect input devices.
• direct input device consists of several classes for example: keyboard, pointing device,scanner, voice recognizer.
• indirect input device comprising: key-to-card, key-to-tape, key-to-disk.
• Modem
• Light pen
• Bar code reader


 II. SECONDARY MEMORY (MEMORY SECONDARY)


Some examples of the size of secondary memory speed is as follows.
• Pre-IDE: It has a speed of 3600 RPM
• IDE: It has a speed of 5200 RPM
• IDE / SCSI: It has a speed of 5400 RPM
• IDE / SCSI: It has a speed of 10,000 RPM


  Some characters, such as:


• The nature of the permanent storage (persistent), so the secondary storage media needs to be separated from the main processing unit (central processing unit / CPU) and main memory (main memory), and is connected by cable / bus to the processing unit (processor) and main memory
(main memory)
• Ability to be used together (shareability)
• The ability to store some data, information, and program


Data processing steps from the secondary memory are


• Determine the location of data on external memory (external memory / storage)
• processor will read the data, and copy data from external memory
• (external memory / storage)Go to the main memory (main memory)



III. OUTPUT DEVICE


The output resulting from processing can be classified into four forms, namely the text (letters, numerals, special symbols), image (in the form of graphs or pictures), sounds,and other forms that can be read by machine (machine-readable form).


Output equipment can be:
• Hard-copy devices,
is a tool used to print text and image on hard media such as paper or film.
• Soft-copy devices,
is a tool used to display text and image in the media in the form of soft electronicsignals.


Output the first form is permanent in nature and more portable (can be removed from the output devices and can be taken anywhere). A common tool that use  this is a printer,plotter, and microfilm equipment. The second form of output can be either a videodisplay, flat panel, and speakers. And the third form of output devices that use magnetic media disk is disk driver, and which use the magnetic tape media is  tape driver.


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