Twin directories of compat20:

[DIR]  ftp://ftp.measurement-factory.com/FreeBSD-3.4.TMF/ftp/compat20/
[DIR]  ftp://ftp.measurement-factory.com/FreeBSD-4.3-TMF/ftp/compat20/
[DIR]  ftp://ftp.afps.chel.su/pub/FreeBSD/3.2-RELEASE/compat20/
[DIR]  ftp://ftp.afps.chel.su/pub/FreeBSD/4.5-RELEASE/compat20/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/old/2.1.7.1-RELEASE/compat20/
[DIR]  ftp://ftp.internat.freebsd.org/pub/FreeBSD/old/2.2.8-RELEASE/compat20/
[DIR]  ftp://ftp.vsi.ru/pub/FreeBSD/releases/i386/4.10-RELEASE/compat20/
[DIR]  ftp://ftp.vsi.ru/pub/FreeBSD/releases/i386/4.11-RELEASE/compat20/
[DIR]  ftp://ftp.vsi.ru/pub/FreeBSD/releases/i386/4.3-RELEASE/compat20/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/NetBSD/packages/current-src/pkgsrc/emulators/compat20/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/release/compat20/
[DIR]  ftp://ftp.uni-hannover.de/pub/mirror/bsd/FreeBSD/development/FreeBSD-CVS/src/lib/compat/compat20/
[DIR]  ftp://ftp.uni-koeln.de/packages/FreeBSD/releases/i386/4.2-RELEASE/compat20/
[DIR]  ftp://ftp.swin.edu.au/freebsd/releases/i386/5.1-RELEASE/compat20/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/lib/compat/compat20/
[DIR]  ftp://ftp.swin.edu.au/freebsd/development/FreeBSD-CVS/src/release/compat20/
[DIR]  ftp://ftp.uar.net/pub/FreeBSD/4.10-RELEASE/compat20/
[DIR]  ftp://ftp.uar.net/pub/FreeBSD/4.11-RELEASE/compat20/
[DIR]  ftp://ftp.uar.net/pub/FreeBSD/4.9-RELEASE/compat20/
[DIR]  ftp://ftp.uar.net/pub/FreeBSD/fso/5.2-RELEASE/compat20/
[DIR]  ftp://ftp.highway1.com.au/pub/FreeBSD/i368/5.0-RELEASE/compat20/
[DIR]  ftp://ftp.highway1.com.au/pub/FreeBSD/i368/5.1-RELEASE/compat20/
[DIR]  ftp://ftp.highway1.com.au/pub/FreeBSD/i368/5.2.1-RELEASE/compat20/
[DIR]  ftp://ftp.highway1.com.au/pub/FreeBSD/i368/5.3-RELEASE/compat20/
[DIR]  ftp://ftp.highway1.com.au/pub/FreeBSD/i368/5.4-RELEASE/compat20/
[DIR]  ftp://ftp.redcom.ru/pub/unix/FreeBSD/3.5.1-RELEASE/compat20/
[DIR]  ftp://ftp.redcom.ru/pub/unix/FreeBSD/4.7-RELEASE/compat20/
[DIR]  ftp://ftp.redcom.ru/pub/unix/FreeBSD/4.8-RELEASE/compat20/
[DIR]  ftp://ftp.redcom.ru/pub/unix/FreeBSD/4.9-RELEASE/compat20/
[DIR]  ftp://ftp.redcom.ru/pub/unix/FreeBSD/5.3-RELEASE/compat20/
[DIR]  ftp://ftp.gascom.ru/pub/FreeBSD/releases/i386/2.2.9-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/5.5-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/5.4-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/4.11-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/4.2-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/4.3-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/4.5-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/4.7-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/4.8-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/4.9-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/4.10-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/2.2.2-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/2.2.5-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/2.2.6-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/2.2.7-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/2.2.8-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/3.3-RELEASE/compat20/
[DIR]  ftp://ftp.lf.net/pub/Mirrors/ftp.freebsd.org/pub/FreeBSD/releases/i386/3.5-RELEASE/compat20/
[DIR]  ftp://ftp.sk.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/src/release/compat20/
[DIR]  ftp://ftp.sk.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/src/lib/compat/compat20/