Компьютерная техника. Еремина Н.В. - 16 стр.

3 Unit III

Kinds of computers

     Using information of the four texts given below, be ready to speak on usage,
characteristics, advantages (disadvantages) of different types of computers.

     3.1 Text 1
Introduction

     Three classes – Every computer has a processor, memory and some type of I/0.
From there computers can be classified as microcomputers, minicomputers, or
mainframes. Each class overlaps the other. Generalized definitions of the three
follow.
     A microcomputer contains a microprocessor, usually located on one LSI (large-
scale imtergrated) chip or small LSI chip set.      The   processor's word length is
between 4 and 8 bits.
     Most microcomputers have at least 256 words of memory. A minicomputer's
word length is between 12 and 16 bits. And its minimum memory size is 4 OS'6
word4.
      A mainframe, or so called large computer, usually has a word length of 52 bits
or more and a minimum memory of l6 384 words.

    3.2 Text 2
Mainframes

     Large computer systems, or mainframes, are those computer systems found in
computer installations processing immense amounts of data. They make use of very
high-speed main memories into which data and programs to be dealt with are
transferred for rapid access. These powerful machines have a larger repertoir of more
complex instructions which can be executed more quickly. Where a smaller computer
may take several steps to perform a particular operation, a larger machine may