2.1 Understand User Interface, File System and Input Output/Control System

User Interface, File System and Input Output/Control System

2.1    Understand User Interface, File System and Input Output/Control System (IOCS)(CLO 2)

User Interface

• Controls how you enter data and instructions and how information displays on screen
• There are 4 types of user interface:
  
  
  1. Command interface
  2. Menu interface
  3. Graphical user interface
  4. Voice-actuated interface

User Interface

File systems

• Support directories which contain the names of files and other directories along with additional information about the files and directories. (E.g. when they were created and last modified).
• A file is the long term storage entity: a named collection of persistent information that can be read or written.
• Secondary storage devices (disk) are too crude to use directly for long term storage. 
• The file system provide logical objects and operation on these object (files).
• The file system provides file management, a standard interface to:

1. To create and delete files and directories.
2. Manipulate (read, write, extend, rename, copy, protect) files and directories.
3. map files onto secondary storage.

• The file system also provides general services such as backups, maintaining mapping information, accounting and quotas.

I/O Control System

• Supports communication with external devices: terminal, keyboard, printer, and mouse.
• Support buffering and spooling of I/O.
• Provides a general device driver interface, hiding the differences among devices, often mimicking the file system interface.
• Provides device driver implementations specific to individual devices,

Continue --->>>