The Art of Assembly Language Programming
- Detailed step by step tutorial.
- http://maven.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html

Intel Processor Manuals
- Official Intel Architecture Optimizations Manual, Intel Architecture Software Developer's Manual, Pentium Processor Family Developer's Manual.
- http://www.intel.com/design/archives/processors/

Wagemakers, Jan
- Assembler and Linux, source examples for Nasm and GAS assemblers.
- http://www.janw.dommel.be/

Ralf Brown's Interrupt List
- List of i386 specific information for IRQ's, and I/O addreses.
- http://www.cs.cmu.edu/~ralf/

Gavin's Guide to 80x86 Assembly
- Fine, well organized tutorial.
- http://www.redbrick.dcu.ie/~creech/assembly/asm.html

Linux Assembly HOWTO
- Guide describes how to program in assembly using free programming tools, focusing on development for or from Linux OS on i386. By Francois-Rene Rideau 1996-1999, Konstantin Boldyshev 1999-2002.
- http://asm.sourceforge.net/howto.html

x86 Assembly Language FAQ
- For the comp.lang.asm.x86 and alt.lang.asm newsgroups.
- http://www.frontiernet.net/~fys/faq/

Programming from the Ground Up
- Book on Linux x86 assembly language programming which is available both in print and online under the GFDL license. Targetted to both new programmers and professional programmers who have not yet learned assembly language.
- http://savannah.nongnu.org/projects/pgubook/

Hamarsoft 86BUGS List
- A reference for bugs and undocumented instructions in the Intel 80x86 family of processors.
- http://www.xs4all.nl/~feldmann/86bugs.htm

Lay Networks - Assembly Language Tutorials
- With source code of some programs.
- http://www.laynetworks.com/assembly%20tutorials.htm

A introduction to x86 assembly
- Tutorial written by Gavin Estey.
- http://help-site.com/local/ASMTUT.TXT

Barry Wilks' DOS INT 21h - DOS Function Codes
- A quick reference list of DOS interrupts has been extracted from a large list compiled by Ralf Brown.
- http://spike.scu.edu.au/~barry/interrupts.html

Microsoft Macro Assembler Reference
- From MSDN Library.
- http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmasm/html/vcoriMicrosoftAssemblerMacroLanguage.asp

Ketman 8086 Tutorial
- Iteractive tutorial, using the Ketman Maximaster as a platform.
- http://www.btinternet.com/~btketman/tutpage.html

Assemble It: Documents
- Very informative docs and tutorials (zip, html) on 3d programming, assembly.
- http://www.xs4all.nl/~smit/docs.htm

A20 - a pain from the past
- The various forms of A20 gate control.
- http://www.win.tue.nl/~aeb/linux/kbd/A20.html

Dr. Dobb's Journal Articles
- 2 dozen works, FAQ, by Robert R. Collins.
- http://x86.ddj.com/ddj/ddj.htm

OOPWeb - Assembly Directory
- Assembly programming tutorials, references and on-line books. All searchable and free.
- http://www.oopweb.com/Assembly/Files/Assembly.html

OpCode of Intel Assembler 80x86
- List of most Mnemonics for x86 with description.
- http://www.jegerlehner.ch/intel/opcode.html

Win32 Assembler Coding Tutorial
- Covers MASM, TASM, NASM used with Win32, DirectX, multimedia. Especially for Games and Demos. Has sample code.
- http://deinmeister.de/wasmtute.htm

x86.org
- Lots of information about x86 processors, including undocumented opcodes and bugs.
- http://www.x86.org/

Sandpile.org
- Archive of technical x86 processor information and downloadable documentation. Includes a discussion forum.
- http://www.sandpile.org/

Assembly Tutorial
- For assembly programming newbies. Well written. Terse.
- http://www.xs4all.nl/~smit/asm01001.htm

Intel Assembler CodeTable 80x86 - Overview Mnemonics
- Short overview containing all instructions (transfer, arithmetic, logic, jumps), a diagram of the registers (EAX, EDX, ECX, EBX), demo program, fits to one single page, download, free
- http://www.jegerlehner.com/intel/