====== Hardware specifications ======
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We strongly encourage all hardware vendors to make their programming guides and register specifications publicly available.  The following documentation is available for free public download.

  * Most older [[http://gkernel.sourceforge.net/specs/3com/|3com adapters]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c359.pdf.bz2|3C359]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c501.pdf.bz2|3C501]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c503.pdf.bz2|3C503]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c505.pdf.bz2|3C505]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c507.pdf.bz2|3C507]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c515.pdf.bz2|3C515]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c523.pdf.bz2|3C523]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c527.pdf.bz2|3C527]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c589d.pdf.bz2|3C589D]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c59x.pdf.bz2|3C59x]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c5x9b.pdf.bz2|3C5x9, 3C5x9B]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c90xb.pdf.bz2|3C90x, 3C90xB]]
    * [[http://gkernel.sourceforge.net/specs/3com/3c90xc.pdf.bz2|3C90xC]]
  * DEC/Intel
    * [[http://gkernel.sourceforge.net/specs/tulip/21040/|21040]]
    * [[http://gkernel.sourceforge.net/specs/tulip/21041/|21041]]
    * [[http://gkernel.sourceforge.net/specs/intel/21145-hrm.pdf.bz2|21145]]
    * [[http://gkernel.sourceforge.net/specs/intel/21143-hrm.pdf.bz2|21143]] ("tulip")
    * [[http://gkernel.sourceforge.net/specs/intel/21145-hrm.pdf.bz2|21145]]
    * [[http://gkernel.sourceforge.net/specs/intel/29736001.pdf.bz2|82558]]
    * [[http://gkernel.sourceforge.net/specs/intel/71468201.pdf.bz2|GD82559ER]]
    * [[http://sourceforge.net/project/showfiles.php?group_id=42302|e100, e1000]]
  * Jato [[http://gkernel.sourceforge.net/specs/jato/lxt1001.pdf|JT1001]]
  * National Semiconductor
    * [[http://gkernel.sourceforge.net/specs/national_semi/DP83815.pdf.bz2|DP83815]] ("natsemi")
    * [[http://gkernel.sourceforge.net/specs/national_semi/DP83821.pdf.bz2|DP83821]]
    * [[http://gkernel.sourceforge.net/specs/national_semi/DP83840A.pdf.bz2|DP83840A]]
  * Neterion
    * [[http://gkernel.sourceforge.net/specs/neterion/Xframe_OSDDG_4.0_BE.pdf.bz2|Xframe I (big endian version)]]
    * [[http://gkernel.sourceforge.net/specs/neterion/Xframe_OSDDG_4.0_LE.pdf.bz2|Xframe I (little endian version)]]
  * RealTek
    * [[http://gkernel.sourceforge.net/specs/realtek/RTL8130.PDF.bz2|8130]]
    * [[http://gkernel.sourceforge.net/specs/realtek/RTL8139.PDF.bz2|8139]]
    * [[http://gkernel.sourceforge.net/specs/realtek/RTL8139A.PDF.bz2|8139A]]
    * [[http://gkernel.sourceforge.net/specs/realtek/RTL8139B.PDF.bz2|8139B]]
    * [[http://gkernel.sourceforge.net/specs/realtek/RTL8139C.PDF.bz2|8139C]]
    * [[http://gkernel.sourceforge.net/specs/realtek/RTL8139C+.PDF.bz2|8139C+]] ("8139too", "8139cp")
    * [[http://gkernel.sourceforge.net/specs/realtek/rtl8169spec_1.1.pdf.bz2|8169]] ("r8169")
  * SiS
    * [[http://gkernel.sourceforge.net/specs/sis/7014.pdf.bz2|7014]]
    * [[http://gkernel.sourceforge.net/specs/sis/7016.pdf.bz2|7016]]
    * [[http://gkernel.sourceforge.net/specs/sis/sis900ds.doc.bz2|900]] ("sis900")
  * SMSC [[http://gkernel.sourceforge.net/specs/smsc/83c175.pdf.bz2|LAN83C175]]
  * VIA [[http://gkernel.sourceforge.net/specs/via/VT86C100A03.pdf.bz2|VT86C100A]] ("via-rhine").
  * Xircom [[http://gkernel.sourceforge.net/specs/xircom/103-0548-001B.pdf.bz2|X3201-3]]

Jeff Garzik archives many of these, and other non-NIC specifications at [[http://gkernel.sourceforge.net/specs/|http://gkernel.sourceforge.net/specs/]].