» 386SWAT A Protected Mode Debugger which provides debugging services to real mode, protected mode, virtual 8086 mode programs, DPMI and VCPI clients, and Win 3.1x and Win95/98 programs under any memory manager while occupying only a few kilobytes of low DOS memory http://www.sudleyplace.com/swat/
» Mouse Programming in DOS Information on using interrupt 33h for mouse programming. Includes free C source code. http://www.geocities.com/rk_page/
» Programming MS-DOS with Power Information on most every aspect of DOS programming. http://www.frontiernet.net/~fys/index.htm
» Ralf Brown's Interrupt List (USA Midwest mirror) A list of interrupts used on the Intel x86 architecture and their meaning with over 9000 linked pages and 350 indexes greatly ease the process of searching. http://ctyme.com/rbrown.htm
» UPX The Ultimate Packer for eXecutables is a portable, extendable, high-performance executable packer for several different executable formats. Freeware. http://upx.sourceforge.net/
» X2FTP Archive General DOS programming material. ftp://ftp.cdrom.com/pub/x2ftp/
» comp.os.msdos.programmer FAQ Freqently asked questions about programming for MS-DOS with tested answers. http://www.jeffc.org/msdos/dos-faq.html