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SYSTEM UNIT
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Internal Data Representation: Numeric Systems, Character Coding, and Memory Storage, Slides of Fundamentals of E-Commerce
An in-depth exploration of internal data representations, focusing on numeric systems (decimal vs binary), character coding schemes (ascii, ebcdic, unicode), and how characters are stored in memory. Key concepts include binary addition examples, coding ranges, and the advantages of standard coding. The document also touches upon system boards and microprocessors.
Typology: Slides
2012/2013
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SYSTEM UNIT
Lecture Objectives
Internal Data Representations^ •
How Numbers are represented?
-^
How Characters are represented?
-^
How Instructions are represented?
Character Coding Schemes^ •
ASCII/ EBCDIC/ UniCode
Internal Data Representation
Numeric representation & calculation
Decimal Vs Binary number systems Conversions (Decimal to Binary and vice versa) Why binary in computers?
Easy to represent using voltage levels Easy to implement binary operations using transistors(adder/divider circuits etc.) Binary Addition Examples
Definitions
Bit Byte
…..Internal Data Representation
How to represent characters?
Coding Schemes Binary coding schemes
ASCII – 8 bit code EBCDIC -8 bit code Unicode – 16 bit code
Coding ranges
8 bit – 256 codes 16 bit – 65536 codes
…..Internal Data Representation
How a character goes into memory? Advantage of standard coding
- Coded data can be shared across different systems – Problems:
- Microcomputer (ASCII)• Mainframe (EBCDIC)
- Solution:
- Conversions are done by specialmiddle layer programs.
- Solution:
- Microcomputer (ASCII)• Mainframe (EBCDIC)
System Board
Allows I/Odevices to
communicate
with the system
unit.
System Board
The board which makes possible the inter connection of allcomputer components. Every system unit component has a direct connection with thisboard.^ Provides wires (data path) in between components.