$100 Computer System

1
100 Computer System

• ??? ???
• ? ? ???
• ????6/16/2006

2
Preface

• Recently , societal requirement should people
  know that computer technology.
• Each of student have one laptop computer for
• accept to a Educations.

3
Index

• Nature and Computer requirement .
• Computer component.
• CPU , Power, OS.
• Computer system with students education.
• Conclusion
• Reference

4
Nature and computer requirement

• Nature requirement
• Only china have 20million above amount of
  students .
• More important thing is they need to around on
  technical environment .
• Students textbook cost
• if per of student in the each of semester
• should pay of 30. 20million 30600
  million

5
Nature and computer requirement

• Computer requirement
• Friendly , colorful .
• Safety , easy to use .
• Lower power and cheap cost.
• Speed fast and comfortable.

6
Computer component
Hardware
software
Core component CPU, Power, Memory ,Drives,
BIOS, Monitor.
Core component OS, application .
E-book, hyperlink
Linux (Red hat)
7
Optimization of Power
Power
Main board
CPU
Driver
Disk
Flash card
8
Innovation trend in future applications
9
Power and Energy

• Supply voltage , clock frequency and activity
  factor . There are used to a dynamic and static
  power .
• Energypower time

10
Low power ----hardware

• Physical
• shorter wire, minimize capacitance
• Logic/Gate
• low leakage, low voltage, time gating, clock
  trees
• Combinational
• Avoid twitches.
• Register-transfer
• Avoid using units.
• Architecture
• slow things down, turn them off, parallel
  processing
• and pipelining.

11
Low power ---software

• Compile
• Instructions selection and reordering, Loop
  optimization (merging
• and unrolling etc.), to reduce switching
• Register allocation to minimize external
  memory access
• Coding
• Rewrite critical blocks (e.g. inner loops) in
  assembly if needed
• Change representation of data
• Algorithm
• Selection the optimized in candidates
• Reducing hot operations
• e.g. external memory R/W, some coprocessor
  operations
• OS
• Dynamic Power Management(DMP) auto-transition
  to low power
• states
• e.g. Suspend, Sleep, Idle etc.

12
Continue

• 25volt power systems
• The reason
• A. Machine charges using some of the available
  energy
• B. Machine doesn't charge, but doesn't break
• C. Machine breaks but doesn't let out toxic smoke
• D. Machine breaks, catches fire, and spews melted
  plastic and rubber on foolish student.
• E. When out-of-spec power is supplied, machine
  screams (audio) for help before breaking ten or
  twenty seconds later.

13
OS and UI

• OS Linux (Red hat)

• LinuxBIOS
• LinuxBIOS port is about 500 lines of assembly and
  5000 linesof C. It executes 16 instructions to
  get into 32bit mode and then performs DRAM and
  other hardware initializations required before
  Linux can take over.

• Linux supports the JFFS2 file system which
  addresses the issue of limited number of Flash
  write cycles

14
start
back
ok
pre
UI
GTK 2.8
GIMP 2
15
Use the flash Memory
16
Anywhere
PC data
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Prototype computer

• Core part
• CPU AMD Geode GX2-500_at_1.0W
• CPU clock speed 500Hz
• Chipset AMD CS5536 South Bridge
• Graphics controller Integrated with Geode CPU
  unified memory architecture
• DRAM memory 128MB dynamic RAM
• BIOS 512KB SPI-interface flash ROM LinuxBIOS
  open-source BIOS
• Mass storage 512MB SLC NAND flash
• Drives No rotating media
• Liquid-crystal display 7.5 Dual-mode TFT
  display

18
Computer system and student education (I)
school
E-book Or Hyperlink
student
19
Reference

• http//wiki.laptop.org/index.php
• M.Weiser, B.Welch, A.Demers ,S. Shenker.
  Scheduling for reduced CPU energy Proceedings of
  the First Symposium on Operating Systems Design
  and Implementation.
• http//www.tldp.org/LDP/tlk/tlk.html
• The art of human computer interface Design
• ------------Editor by BRENDA LAUREL
• www.linux .org
• www.apm.com