IA64 Architecture Documentation

Being the result of a team-up of Hewlett Packard and Intel, the IA64 is a promising approach to wind out of that IA32 mess. It uses a new paradigm called 'VLIW' (very long instruction words) to be able to overcome both the deficiencies of CISC and RISC based designs. There is still a real load of development going on, but we hopefully see this architecture replacing the old x86's soon.

File	Size	Description	Source
IA-64 Architecture Software Developers Manual Vol.1: IA-64 Application Architecture v1.1 (pdf)	2031 kb	Basic introduction	Intel
IA-64 Architecture Software Developers Manual Vol.2: IA-64 System Architecture v.1.1 (pdf)	6484 kb	CPU low level information	Intel
IA-64 Architecture Software Developers Manual Vol.3: IA-64 Instruction Set Reference v1.1 (pdf)	7850 kb	What you were looking for, really ;)	Intel
IA-64 Architecture Software Developers Manual Vol.4: IA-64 Itanium Processor Programmers Guide v1.1 (pdf)	1477 kb	IA-64 as in the Itanium	Intel

More information is available from Intel's developer site and the usual place.