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  - [Meet Mach](http://www.stepwise.com/Articles/Technical/MeetMach.html), a
    summary of Mach's history and main concepts.

  - OSF's [Kernel Interface (ps)](ftp://ftp.cs.cmu.edu/afs/cs/project/mach/public/doc/osf/kernel_interface.ps)
    [Kernel Interface (pdf)](http://shakthimaan.com/downloads/hurd/kernel_interface.pdf) 

  - OSF's [Kernel Principles (ps)](ftp://ftp.cs.cmu.edu/afs/cs/project/mach/public/doc/osf/kernel_principles.ps) 
    [Kernel Principles (pdf)] (http://shakthimaan.com/downloads/hurd/kernel_principles.pdf)

  - [Porting and Modifying the Mach 3.0 Microkernel] (http://shakthimaan.com/downloads/hurd/Porting%20and%20Modifying%20the%20Mach%203.0%20Microkernel.pdf)

  - [An IO System for Mach] (http://shakthimaan.com/downloads/hurd/An%20IO%20System%20for%20Mach.pdf)

  - [A Programmers' Guide to Mach System Call] (http://shakthimaan.com/downloads/hurd/A.Programmers.Guide.to.the.Mach.System.Calls.pdf)