Principles of Operation for pSeries ?



Ever since I started with S/370 (in BC mode yet) and up through
z/Architecture, I've referred to Principles Of Operation a la
http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/dz9zr002/CCONTENTS

Is there an equivalent reference manual for pSeries machines?

Thanks,
Don