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Layered Software: Example

Layered Software: Example

Application layer: Microsoft PowerPoint

OS layer: Windows 95

Hardware layer: 200MHz Pentium; 1024x768 monitor

(1) hit PageDown key

(2) read next slide

from ppt file

(3) read some blocks

from disk to RAM

(4) RAM is

ready

(5) ppt data

ready

(6) show new

screen image

(7) write video

RAM to screen

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