2 Lecture Notes for This WeekIndex

2.1 From the Class Notes link on the Course Home PageIndex

120_CharacterEncoding.html - Character Encoding / Line Ends
- know these Seven Famous ASCII Characters: 0D 0A 20 30 41 61 7F
- do not memorize any EBCDIC
130_big_picture.txt - The Big Picture on Bit Patterns
140_attack.txt - Remote Attack Script uses hexadecimal obfuscation
145_textbook_secrets.txt - Alcatel-Lucent Traning Manual containing secret messages in hexadecimal
200_DEBUGbasics.html
200_DEBUGhelp.txt

2.1.1 AssignmentsIndex

Assignment #05 - In-lab assignment on character decoding. No upload needed.
000_self_mark.txt - Self-mark of Assignment NN (participation mark)

2.2 From Blackboard Course DocumentsIndex

These documents have restricted distribution and cannot be put on the Course Home Page.

02.ppt - Data Representation
- Character encoding: ASCII, Unicode, Line Endings
06.ppt - Memory
- only read memory speeds on slide 7 this week
- omit the rest of this slide set for this week

2.3 From the InternetIndex

http://en.wikipedia.org/wiki/American_Standard_Code_for_Information_Interchange
http://en.wikipedia.org/wiki/Latin-1
http://en.wikipedia.org/wiki/Unicode
http://en.wikipedia.org/wiki/UTF-8
http://en.wikipedia.org/wiki/ISO/IEC_8859 - a joint ISO and IEC series of standards for 8-bit character encodings
http://czyborra.com/charsets/iso8859.html - The ISO 8859 Alphabet Soup
http://en.wikipedia.org/wiki/UTF-8

2.4 From the Classroom Whiteboard/ChalkboardIndex

Your in-class notes go here.

2.4.1 Character EncodingIndex

Character codes: ASCII, extended ASCII, EBCDIC, Unicode, UTF-8
- ASCII Control Characters (unprintable)
- line ends for text files on Unix/Mac/Windows
- reading character tables
- compare ASCII & EBCDIC for sort order and common printable characters
- ASCII puts ‘A’ before ‘a’; EBCDIC does the reverse
- tabs vs. spaces
- know the Seven Famous ASCII Characters
  - 0D 0A 20 30 41 61 7F
- do not memorize any EBCDIC
- how to print the decimal value of 00001111(2) on the screen in ASCII?
  - decimal value is 15: send 31h and 35h (“1” and “5”)
Problems with all the 8-bit extended-ASCII character sets
- can’t have Latin1 French and Latin2 Polish in the same text file: why?
UTF-8 advantages and disadvantages
- same as ASCII, no endian-ness, multi-byte, full Unicode, may require more bytes than Unicode
Fonts vs. Character codes
- codes only say what letter, not what it looks like
Why can’t French (Latin1) and Polish (Latin2) exist in the same text file?
- same problem for all the 8-bit extended-ASCII character sets
Memory speeds (latencies) (06.ppt #7)
- 1ns-2ns - registers
- 3ns-10ns - Level 1 Cache
- 25ns-50ns - Level 2 Cache
- 30ns-90ns - main memory
- 5ms-20ms - fixed hard disk
- Source: 06.ppt slide 7 (under [Blackboard] Course Content - Slides)

Author: 
| Ian! D. Allen  -  idallen@idallen.ca  -  Ottawa, Ontario, Canada
| Home Page: http://idallen.com/   Contact Improv: http://contactimprov.ca/
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Plain Text - plain text version of this page in Pandoc Markdown format

Week 06 Notes for CST8281 - Fall 2011

1 Midterm Test #1 - 15%Index

2 Lecture Notes for This WeekIndex

2.1 From the Class Notes link on the Course Home PageIndex

2.1.1 AssignmentsIndex

2.2 From Blackboard Course DocumentsIndex

2.3 From the InternetIndex

2.4 From the Classroom Whiteboard/ChalkboardIndex

2.4.1 Character EncodingIndex