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James Harland james.harland@rmit.edu.au
COSC1078 Introduction to Information Technology Lecture 12 System Fundamentals James Harland Lecture 12: System Fundamentals Intro to IT
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Introduction to IT 1-4 Introduction, Images, Audio, Video 5 Computer Fundamentals Assignment 1, WebLearn Test 1 6 Computer Fundamentals Tuesday April 13th, Wednesday April 14th 7 Computer Fundamentals /Review/Catch Up 8 Operating Systems WebLearn Test 2 9 Operating Systems Assignment 2 10 Internet 11 Internet Security WebLearn Test 3 12 Future of IT Assignment 3, Peer and Self Assessment Lecture 12: Computer Fundamentals Intro to IT
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Overview Questions? WebTest 1 Review/Catch up Computer Fundamentals
Lecture 12: Computer Fundamentals Intro to IT
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Web Test 1 There was a buggy question on the test
Not everyone would have done it Best effort on Test 1 or Test 1A will count Buggy question will be ignored Lecture 12: Computer Fundamentals Intro to IT
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Review /Catch Up Next week!
Let me know via of any requests for material Otherwise I will choose what to cover … Requests in by this week Lecture 12: Computer Fundamentals Intro to IT 5
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What do computers do? Compute! Input/Output Processing Memory
Lecture 12: Computer Fundamentals Intro to IT
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Fetch Decode Execute FETCH Machine cycle EXECUTE DECODE
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Two special registers Instruction register: holds current instruction
Program counter: address of next instruction Fetch: Put instruction specified by program counter into instruction register Increment program counter by two Decode: Work out what to do Execute: Perform the instruction Lecture 11: Computer Fundamentals Intro to IT 8
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Processing A0 A0 15 A1 6C A2 16 Program Counter A3 6D A4 50 A5 56
Address Contents A0 A0 15 A1 6C A A3 6D A A A A7 C0 A8 C0 A Program Counter Instruction Register Lecture 11: Computer Fundamentals Intro to IT 9
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Processing A0 FETCH 156C A0 15 A1 6C A2 16 Program Counter A3 6D A4 50
Instruction Register Lecture 11: Computer Fundamentals Intro to IT 10
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Processing A2 FETCH 156C A0 15 A1 6C A2 16 Program Counter A3 6D A4 50
Instruction Register Lecture 11: Computer Fundamentals Intro to IT 11
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Processing A2 DECODE 156C A0 15 A1 6C A2 16 A3 6D A4 50 A5 56 A6 30
6C 2B DECODE Program Counter 156C Instruction Register Lecture 11: Computer Fundamentals Intro to IT 12
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Processing A2 EXEC 156C 5 2B A0 15 A1 6C A2 16 A3 6D A4 50 A5 56 A6 30
Program Counter EXEC 156C Instruction Register 5 2B Lecture 11: Computer Fundamentals Intro to IT 13
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Processing A2 FETCH 166D A0 15 A1 6C A2 16 Program Counter A3 6D A4 50
Instruction Register Lecture 11: Computer Fundamentals Intro to IT 14
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Processing A4 FETCH 166D A0 15 A1 6C A2 16 Program Counter A3 6D A4 50
Instruction Register Lecture 11: Computer Fundamentals Intro to IT 15
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Processing A4 DECODE 166D A0 15 A1 6C A2 16 Program Counter A3 6D
Instruction Register Lecture 11: Computer Fundamentals Intro to IT 16
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Processing A4 EXEC 166D 6 FF A0 15 A1 6C A2 16 A3 6D A4 50 A5 56 A6 30
Program Counter 166D Instruction Register 6 FF Lecture 11: Computer Fundamentals Intro to IT 17
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Processing A6 FETCH 5056 A0 15 A1 6C A2 16 Program Counter A3 6D A4 50
Instruction Register Lecture 11: Computer Fundamentals Intro to IT 18
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Processing … A0 15 A1 6C A2 16 Program Counter A3 6D A4 50 A5 56 A6 30
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Processing B4 EXEC B258 Program Counter Instruction Register
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Processing 58 EXEC B258 Program Counter Instruction Register
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Connecting devices ? ? Lecture 3: System Internals Intro to IT
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Universal Serial Bus (USB)
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Memory-mapped I/O C4 EXEC 3634 Just like writing to a memory address 6
34 FF EXEC Program Counter 3634 Instruction Register Just like writing to a memory address 6 FF Lecture 11: Computer Fundamentals Intro to IT 24
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Direct Memory Access (DMA)
Put some data in memory! OK Lecture 11: Computer Fundamentals Intro to IT 25
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Direct Memory Access Direct Memory Access means that
doesn’t have to wait for the Lecture 11: Computer Fundamentals Intro to IT 26
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What are these? bottleneck Firewire Serial port Parallel port
handshake bandwidth Lecture 11: Computer Fundamentals Intro to IT 27
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Busy Bertie the bus … Von Neumann bottleneck
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Conclusion Assignment 2 specified sometime this week
Finish reading book! Lecture 11: Computer Fundamentals Intro to IT
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