I'm seeking for precise informations about the following PPC
- IBM 401 & 402
- PPC 75xx
- PPC 620
- Power 3/4/5
- RS64 I/II (aka A50/NorthStar), III (aka Pulsar), IV (aka SStar)

What I mean with 'precise informations' is: full registers description,
including specific SPRs, DCRs and on-chip devices for 4xx, and full
specific instructions specification.
The best would be the CPUs user manuals (but I doubt they are available
for Power & RS64...).

I'd also like to get precise informations about Power and Power2.