Not entirely certain its on topic.. if it is, its just
barely..  
Closer than I expected....
  Anyone know much about'm?   In particularly,
sources of electronic
 hardware documentation? (Service Guide?)     
Have you checked the IBM Website?
  I just got handed one, along w/ a AIX 5.1 media set..
Now I get to go
 have fun..   Course, it would be nice to know exactly what bits I'm
 pulling out of it, as I poke at its innards. . 
I'll warn you, AIX (pronounced Aches) isn't the most fun of OS's, for a Unix
box at home, I prefer IRIX, Solaris, or for a secure system OpenBSD.
  Speaking of Google, googling for the above subject
turns up a few
 billion memory dealers, and a few SpecInt pages. :-( 
Just so happens I keep that info around for a lot of the older systems....
System            CPU        ClkMHz  Cache      SPECint SPECfp  Info
Name              (NUMx)Type ext/in  Ext+I/D      95      95    Date
================= ========== ======= ========== ======= ======= =====
IBM 59H/R20       POWER2     66      1M+32/128    3.37    9.80  Sep96
                Zane