Page 23 - DCAP101_BASIC_COMPUTER_SKILLS

Basic Computer Skills

Notes A PC may have CPU-IC such as Intel 8088, 80286, 80386, 80486, Celeron, Pentium, Pentium
Pro, Pentium II, Pentium III, Pentium IV, Dual Core, and AMD etc.

The activity of processing data using a computer is called data processing.
Data is raw material used as input to data processing and information is
processed data obtained as output of data processing.

Success Story of First Generation Computers

t is the Bendix G-15 General Purpose Digital Computer, a First Generation computer
Iintroduced in 1956.
Bendix introduced their G-15 in 1956. It was not the first Bendix computing machine. They
introduced a model named the D-12, in 1954. However, the D-12 was a digital differential
analyser and not a general purpose computer.
The G-15 was superceded by the second generation (transistorised) Bendix G-20.
The Bendix G-15 was a fairly sophisticated, medium size computer for its day. It used
a magnetic drum for internal memory storage and had 180 tube packages and 300
germanium diode packages for logical circuitry. Cooling was by internal forced air.
Storage on the Magnetic Drum comprised 2160 words in twenty channels of 108 words
each. Average access time was 4.5 milliseconds. In addition, there were 16 words of fast-
access storagein four channels of 4 words each, with average access time of 0.54
milliseconds; and eight words in registers consisting of 1 one-word command register,
1 one-word arithmetic register, and 3 two-word arithmetic registers for double-precision
operations.
Contd...

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