SPARC
-----
-* `SPARC resources <http://www.sparc.org/resource.htm>`_
-* `SPARC standards <http://www.sparc.org/standards.html>`_
+* `SPARC standards <http://sparc.org/standards>`_
+* `SPARC V9 ABI <http://sparc.org/standards/64.psabi.1.35.ps.Z>`_
+* `SPARC V8 ABI <http://sparc.org/standards/psABI3rd.pdf>`_
SystemZ
-------
* `Calling conventions for different C++ compilers and operating systems <http://www.agner.org/optimize/calling_conventions.pdf>`_
+XCore
+-----
+
+* `The XMOS XS1 Architecture (ISA) <https://www.xmos.com/en/download/public/The-XMOS-XS1-Architecture%28X7879A%29.pdf>`_
+* `Tools Development Guide (includes ABI) <https://www.xmos.com/download/public/Tools-Development-Guide%28X9114A%29.pdf>`_
+
Other relevant lists
--------------------