The unit is slow, and sometimes the display isn't what you expect. 5^5 is 3124.9993 after about 3 seconds of thought.
I have an MK-61 on the way in from Ukraine. Essentially the same calculator, but in a handheld format. I'm promised a manual (на русском языке, конечно) with that one, which should help with the more abstruse programming functions.
The unit has a vacuum fluorescent display with bluish green numbers. Sara responded "Damned commies...they can't even do red right!" (She was expecting a red LED display.)
Calculator forensic analysts, the number is 9.0881454.