"Officially" the H50 supports AIX, nothing else. Linux might work (even though it is not supported by IBM, thats the "official" part) and maybe some BSD variant (none of which i have experience with,...
As this link suggests ("http://www-03.ibm.com/systems/power/hardware/rs6000/enterprise/h50.html) IBM withdrew the H50 in 2000. "End of support" was perhaps several years...
bakunin I'd say you were about 5 years out there, this shows 2009 code:
http://www14.software.ibm.com/webapp/set2/firmware/lgjsn?mode=1&mtm=7025-H50
HTH
Great! I saw only now that i forgot to mention terminal emulators instead of physical terminals. putty will work, kermit or its clones will probably too. Anyways, you got it running, so this is only...
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...