86online
Includes Hamarsoft 86BUGS list Online, list of documented and undocumented errors in Intel microprocessors, as well as undocumented instructions.
Art of Assembly Language Programming and HLA
ASM 4 Newbies
for the beginner.
Assembly Language Sources
Instructions of x86
describes Intel processor instructions through 486.
Intel Secrets - What Intel Doesn"t Want You To Know
undocumented features; i.e. bugs. and good assembler programming info.
Leonid Mamtchenkov"s Assembly Page
Linux Assembly
NASM - The Netwide Assembler Project
a free 80x86 assembler.
Paul Hsieh"s Assmebly Language Page
great list of assembly resources plus links to articles on performance optimization, op code generation, etc.
PC Assembly Language
includes tutorials/demos of programs for newcomers as well as information for advanced programmers.
Portals Universal Macro Compiler
allows assembler programmers to create High Level Languages of their own design.
Usenet - alt.lang.asm
Assembly languages of various flavors.
Usenet - comp.lang.asm.x86
General 80x86 assembly language programming.
Usenet - comp.lang.asm370