Mainframe computer

           Mainframe computers are system that
offer faster processing speed and greater
storage capacity than a typical mini. The
whole series of mainframe models. ranging form
small to very large are usually lumped together as
a family designation by mainframes
vendors
         The space required for the installation
of these computers is about 100 sq . ft because
in peripheral devices connected to it are also large.
Most of the mainframe computers have
the following accessories. They are;

• central processing unit
• 4 to 8 tape units
• 4 to 6 hard disk units
• card readers
• many  visual display
• uninterrupted power supply system 
• line printers
• Modulators and Demodulators
• Workstations, etc