• Mainframe power computer that uses more than one processor (e.g. 8 - 256 processors)
• Used to serve several transactions simultaneously (e.g. ATM)
Evolution of Microprocessors
• Intel
• 8086, 80286, 80386, 80486, Pentium
• Motorola
• 68000
• Cyrix
• AMD
First microprocesser is Intel 4004
INPUT DEVICES
Accept data & instructions from the user or from another computer system & converts them to the machine readable form.
The form of the input may be by means of
1. Keyboard & Pointing devices (mouse, track ball, joy stick, touch screen)
n A mouse is a device that can be rolled on a desktop to direct a pointer (cursor) on the
computers display screen. The cursor is the
symbol on the screen that shows where data
may be entered next or the command to be
activated.
n Pointing devices commonly have two or three
buttons that are used to issue commands to the
computer.
n A trackball performs like a stationary, upside-down mouse.