General Computer Architecture
Encylopedia for Computer and other Terms.
Intel's microprocessor hall of fame
Microprocessors of the past and present
SPEC Benchmark organization
Specific Instruction set architectures
Intel's x86 Instruction Set Reference Manual
Compaq/Intel (Digital) Alpha Architecture Handbook
Advanced RISC Microprocessor (ARM) manuals
IBM PowerPC Architecture Manuals
HP PA-Risc Architecture Manual