Well, a fairly handy reference might be the PowerPC 601 ISA docs: http://www.freescale.com/files/32bit/doc/user_guide/MPC601UM.pdf http://www.freescale.com/file

Well, a fairly handy reference might be the PowerPC 601 ISA docs: http://www.freescale.com/files/32bit/doc/user_guide/MPC601UM.pdf http://www.freescale.com/files/32bit/doc/user_guide/MPC601UM... Chapter 3 touches on memory addressing modes. The 601 was more compatible with the full POWER ISA that came before it, but looking at the docs for the POWER ISA itself would probably be more instructive.