Yes. IIRC it won't even run 5.2 because it was a rs6k-pc (or something such - the same as the 43P-140, which had the same problem) platform. If memory serves right the 6H1/6H0 series was introduced as a successor because of that.

The rs6k would not switch off the serial interface like the modern machines do with the HMC connections. The settings are 8,N,1 at 9600 baud (19200 was introduced with the Regatta, IIRC). You need a nullmodem-cable and a gender-changer. IBM used to sell these cables (for something like $100 apiece, LOL) ready-made, but you can easily build your own with a minimum of soldering expertise. The following pinout might help, which explains also the reason why not every cable works:

RS6000 (AIX) Console Connection Cable Wiring

No. You need either a terminal (like the once ubiquitous IBM3151), which can either emulate a "Wyse60" (recommended) or any other known terminal (be warned, though, that the standard terms like "vt100" were crappily defined in AIX - best works the Wyse60 and the ibm3151, but the latter is emulated correctly only by itself).

I hope this helps.

bakunin