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Clarify OSTEP: add missing link, fix prerequisite
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@ -226,7 +226,7 @@ Courses | Duration | Effort | Additional Text / Assignments| Prerequisites | Dis
:-- | :--: | :--: | :--: | :--: | :--:
[Build a Modern Computer from First Principles: From Nand to Tetris](https://www.coursera.org/learn/build-a-computer) ([alt](https://www.nand2tetris.org/)) | 6 weeks | 7-13 hours/week | - | C-like programming language | [chat](https://discord.gg/vxB2DRV)
[Build a Modern Computer from First Principles: Nand to Tetris Part II ](https://www.coursera.org/learn/nand2tetris2) | 6 weeks | 12-18 hours/week | - | one of [these programming languages](https://user-images.githubusercontent.com/2046800/35426340-f6ce6358-026a-11e8-8bbb-4e95ac36b1d7.png), From Nand to Tetris Part I | [chat](https://discord.gg/AsUXcPu)
[Operating Systems: Three Easy Pieces](coursepages/ostep/README.md) | 10-12 weeks | 6-10 hours/week | - | [strong C programming](/coursepages/ostep/README.md#prerequisites) | [chat](https://discord.gg/wZNgpep)
[Operating Systems: Three Easy Pieces](coursepages/ostep/README.md) | 10-12 weeks | 6-10 hours/week | - | Nand to Tetris Part II | [chat](https://discord.gg/wZNgpep)
[Computer Networking: a Top-Down Approach](http://gaia.cs.umass.edu/kurose_ross/online_lectures.htm)| 8 weeks | 4–12 hours/week | [Wireshark Labs](http://gaia.cs.umass.edu/kurose_ross/wireshark.php) | algebra, probability, basic CS | [chat](https://discord.gg/MJ9YXyV)
### Core theory

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coursepages/ostep/README.md
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@ -18,15 +18,24 @@ This should take about 8 weeks, 10 hours/week. That's all you need to do!
You will need a Unix/Linux system, some basic command line tools, and a C compiler (such as GCC or Clang). On Windows, you can install Ubuntu in a virtual machine, or use WSL (Windows Subsystem for Linux). Mac OS is Unix-like, so it should be OK to use.
Question: I see some C code in this book. How much C do I need to know?
### Course Links
Answer: You'll need to read and understand some C code in this book. You'll need basic understanding of arrays, pointers and print formatting. You can consult the free book Modern C by Jen Gustadt. The CS50 Manual pages are also helpful to look up functions. You shouldn't spend too much time on learning C.
* [Book](https://pages.cs.wisc.edu/~remzi/OSTEP/)
* [Homework](https://pages.cs.wisc.edu/~remzi/OSTEP/Homework/homework.html)
* [Homework Source Code Repo](https://github.com/remzi-arpacidusseau/ostep-homework)
* [Homework Solutions](https://github.com/xxyzz/ostep-hw)
### C
**Question**: I see some C code in this book. How much C do I need to know?
**Answer**: You'll need to read and understand some C code in this book. You'll need basic understanding of arrays, pointers and print formatting. You can consult the free book [Modern C](https://hal.inria.fr/hal-02383654/file/ModernC.pdf) by [Jen Gustadt](https://gustedt.gitlabpages.inria.fr/modern-c/). The [CS50 Manual pages](https://manual.cs50.io) are also helpful to look up functions. You shouldn't spend too much time on learning C.
The code you'll read is fairly simple and presented in short fragments. The book helps you out quite a bit by manually introducing many C APIs such as the Process API, the Thread API, and so on. You can type, compile and run the code fragments, and read the corresponding explanations. The book explains them in great detail in a conversational style that's fun to read.
You will also write a little bit of C code. Only a minority of the chapters (about 10 out of 50) ask you to write some C code (while the other chapters require you to run provided simulation code and answer questions). These are usually simple, short C programs that imitate the code that was presented in that chapter, with small modifications.
If you are getting stuck on these, please don't spend too much time on them. There is a great solution set here. There is no honor code for this, so you are free to use the solutions. If you find yourself spending too much time, feel free to read and understand the solutions instead. Your main priority should be to gain understanding of operating systems concepts, not to master C coding.
If you are getting stuck on these, please don't spend too much time on them. There is a great solution set [here](https://github.com/xxyzz/ostep-hw). There is no honor code for this, so you are free to use the solutions. If you find yourself spending too much time, feel free to read and understand the solutions instead. Your main priority should be to gain understanding of operating systems concepts, not to master C coding.
## Extended Approach
@ -48,7 +57,8 @@ You should also finish both parts of Nand2Tetris before starting this course. OS
* [Book](https://pages.cs.wisc.edu/~remzi/OSTEP/)
* [Lecture videos](https://pages.cs.wisc.edu/~remzi/Classes/537/Spring2018/Discussion/videos.html)
* [Homework](https://pages.cs.wisc.edu/~remzi/OSTEP/Homework/homework.html)
* [Homework repo](https://github.com/remzi-arpacidusseau/ostep-homework)
* [Homework Source Code Repo](https://github.com/remzi-arpacidusseau/ostep-homework)
* [Homework Solutions](https://github.com/xxyzz/ostep-hw)
* [Projects](https://github.com/remzi-arpacidusseau/ostep-projects)
* [xv6](https://github.com/mit-pdos/xv6-public)