Look at the bottom of dried up lakes as I heard they made great boat anchors.
Instructions unclear, currently at bottom of the Pacific. Found Integrity hardware, but nothing actually useful.
i series is identical at the CMOS level to p series, and was already around 1990 when those were called OS/400 and RS/6000, resp. Dunno about System/360 times. Ofc DB/2 and RPG aren't exactly made for general-purpose computing ;) but there's something called ILE for C/C++ programming on i series (and z series) I believe.
They are now, but they weren't always.
RS/6000 evolved from the RT PC, of course. Successive generations of POWER are substantially different.