Lec04 Input, Output,Processing and Storage
What is a Computer (IPOS) [Slide #02]
Input [Slide #03]
Keyboard; Types of keyboards, How keyboards Work, Arrangement of keys [Slide #04-08]
Mouse, Trackball [Slide #09-10]
Pen Input, Motion input [Slide #11-12]
Audio input, Video Input, Optical Scanners [Slide #13-15]
Output [Slide #16]
Display; Common display quality [Slide #17-18]
Printers; Laser and Inject, Printer Measurements [Slide #19-21]
Combining Input and Output [Slide #22]
System Unit [Slide #23]
Mother Board [Slide #24]
CPU; How it works, components; Machine Cycle [Slide #25-27]
RAM; How it works, managing memory [Slide #28-30]
Virtual Memory [Slide #31]
ROM and CMOS [Slide #32]
Booting up and Shutting down [Slide #33-34]
Storage [Slide #35]]
Capacity [Slide #36]
Storage vs Memory [Slide #37]
Storage access time [Slide #38]
Magnetic hard disk; measurement [Slide #39-40]
Optical Storage Media [Slide #41]
Cloud Storage [Slide #42]
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Execution of a simple program:
We write program instructions:
set x to 3, y to 4, z to x+y
Translated to machine instructions:
where to find z
Operation : add, move to eax, etc..
Memory address
(instructions fetched and stored at this location)
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RAM – Random Access Memory
What is “Random Access”?
- Can access all positions quickly
- An opposite:
Can we take the
middle portion?
No!
Any computer storage like this?
Yes. Magnetic tape
64 bits path;
Separate contacts on each side
 Twice as much data as a single SIMM
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Magnetic Tape (Sequential Access)
http://educationportal.com/academy/less
on/magnetic-storagedefinition-devicesexamples.html#lesson
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http://www.delete-computer-history.com/increase-virtual-memory.html
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Virtual Memory
http://news.techgenie.com/latest/virtual-memory-as-an-alternative-to-speed-up-pc/
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