MGMT 1000 Lecture Notes - Lecture 18: Floppy Disk
MGMT 1000 Lecture 18 Notes – Fractions
Introduction
• The conversion in the other direction works identically.
• Thus, 2753318 becomes 010 111 101 011 011 0012
• For practice, now convert this value to hexadecimal.
• Most computer manufacturers today prefer to use hexadecimal, since a 16-bit or 32-bit
number can be represented exactly by a four- or eight-digit hexadecimal number.
• How many octal digits would be required?
• A few manufacturers still use octal representation for some applications.
• You might ask why it is necessary to represent data in binary form at all.
• After all, the binary form is used within the computer, where it is usually invisible to the
user.
• There are many occasions, however, where the ability to read the binary data is very
useful.
• Remember that the computer stores both instructions and data in binary form.
• Whe debuggig a progra, it ay be desirable to be able to read the progra’s
instructions and to determine intermediate data steps that the computer is using.
• Older computers used to provide binary dumps for this purpose.
• Binary dumps were complete octal listings of everything stored in memory at the time
the dump was requested.
• Even today it is sometimes important, for example, to be able to read the binary data
from a floppy disk to recover a lost or damaged file.
• Modern computer operating systems and networks present a variety of troubleshooting
data in hexadecimal form.
• Conversions between binary and hexadecimal notation are used frequently.
• We strongly recommend that you practice to become proficient at working with
hexadecimal notation.
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