Twin directories of DOS:

[DIR]  ftp://ftp.netvision.net.il/pub/DOS/
[DIR]  ftp://ftp.vvm.com/pub/rtl-floppy/NWCLIENT/DOS/
[DIR]  ftp://ftp.unice.fr/users/courseau/Partage/Driver USB Port Series/AUTO_SW/Af152/DOS/
[DIR]  ftp://ftp.unice.fr/users/courseau/Partage/Driver USB Port Series/AUTO_SW/As2p/DOS/
[DIR]  ftp://ftp.unice.fr/users/courseau/Partage/Driver USB Port Series/AUTO_SW/As4p/DOS/
[DIR]  ftp://ftp.unice.fr/users/courseau/Partage/Driver USB Port Series/PRINTER.NET/As248/DOS/
[DIR]  ftp://ftp.eenet.ee/pub/cpan/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.eutelia.it/pub2/CPAN_Mirror/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.saintjoe.edu/pub/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.ipswitch.com/ipswitch/Product_Support/Piper/DOS/
[DIR]  ftp://ftp1.fkkt.uni-lj.si/3com509b/Disk2/NDIS2/DOS/
[DIR]  ftp://ftp1.fkkt.uni-lj.si/3com905x/DISK2/NDIS2/DOS/
[DIR]  ftp://ftp.kfki.hu/pub/packages/perl/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://62.128.1.71/pub/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.rdc.cl/pub/Unix/Linux/Perl/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.barnyard.co.uk/cpm/walnut-creek-CDROM/UTILS/DOS/
[DIR]  ftp://ftp.etext.org/pub/Libellus/utils/DOS/
[DIR]  ftp://ftp.cmo.de/pub/Computer/DOS/
[DIR]  ftp://ftp.kreonet.re.kr/tools/utils/mc/DOS/
[DIR]  ftp://ftp.kreonet.re.kr/languages/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.imf.au.dk/pub/mks/drivers/aten/AUTO_SW/Af152/DOS/
[DIR]  ftp://ftp.imf.au.dk/pub/mks/drivers/aten/AUTO_SW/As2p/DOS/
[DIR]  ftp://ftp.imf.au.dk/pub/mks/drivers/aten/AUTO_SW/As4p/DOS/
[DIR]  ftp://ftp.imf.au.dk/pub/mks/drivers/aten/PRINTER.NET/As248/DOS/
[DIR]  ftp://ftp.cs.sunysb.edu/pub/XSB/DOS/
[DIR]  ftp://ftp.tech2.de/UTILITIES/LANUtilities/Broadcom/BroadcomNetExtreme_teaming/DOS/
[DIR]  ftp://ftp.tech2.de/BOARDS/5375/LAN/Windows/V12.3/APPS/iSCSI/iSCSIUtl/DOS/
[DIR]  ftp://ftp.tech2.de/BOARDS/5375/LAN/Windows/V12.3/APPS/ASF/DOS/
[DIR]  ftp://ftp.nnz.ru/pub/is/LEX/driver/LAN/INTEL/I82540/CARDBUS/DOS/
[DIR]  ftp://ftp.nnz.ru/pub/is/LEX/driver/INTEL/I82852_5/SOUND/VIA/68/DOS/
[DIR]  ftp://ftp.nnz.ru/pub/is/LEX/driver/VIA/VIAUDIO/68/DOS/
[DIR]  ftp://ftp.nnz.ru/pub/is/LEX/driver/LAN/INTEL/I82541/DOS/
[DIR]  ftp://ftp.nnz.ru/pub/is/LEX/driver/LAN/INTEL/I82540/DOS/
[DIR]  ftp://ftp.port80.se/pub/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.informatik.uni-oldenburg.de/pub/fool/binaries/DOS/
[DIR]  ftp://ftp.cs.technion.ac.il/pub/ssl/Pub/DOS/
[DIR]  ftp://ftp.kulnet.kuleuven.ac.be/mirror/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.amigascne.org/mirrors/ftp.modland.com/pub/players/DOS/
[DIR]  ftp://ftp.amigascne.org/mirrors/ftp.modland.com/pub/trackers/DOS/
[DIR]  ftp://ftp.amigascne.org/mirrors/ftp.modland.com/pub/modules/RealSID/DOS/
[DIR]  ftp://ftp.amigascne.org/mirrors/ftp.modland.com/pub/modules/PlaySID/DOS/
[DIR]  ftp://ftp.ncsa.uiuc.edu/PC/DOS/
[DIR]  ftp://ftp.ncsa.uiuc.edu/Telnet/DOS/
[DIR]  ftp://ftp.ncsa.uiuc.edu/Visualization/Image/DOS/
[DIR]  ftp://ftp.ncsa.uiuc.edu/Visualization/PCShow/DOS/
[DIR]  ftp://ftp.wh2.tu-dresden.de/pub/mirrors/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.cosy.sbg.ac.at/pub/mirror/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.mgts.by/pub/CPAN/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.cyf-kr.edu.pl/pub/unix/perl/authors/id/D/DO/DOS/
[DIR]  ftp://ftp.graphics.stanford.edu/pub/rayshade/Ports/DOS/