H->HMS conversion HP-15C vs. HP42S vs HP67

[burkhard]

I tried an additional few emulators (or simulators... I don't know each of their inner workings) and hardware calculators I didn't see already checked above:

1) iOS 15C app "Retro15C" yields 146°54'56". Indeed, that is off a bit!
2) iOS WP34S app yields the correct 146°54'24".
3) iOS WP31S app yields the correct 146°54'24".
4) iOS 41C app "i41CX+" yields the correct 146°54'24".
5) HARDWARE: a USA made original 1988 15C. It returns the correct 146°54'24"
6) HARDWARE: a more modern (2011) 15C Limited Edition. It returns the correct 146°54'24".