This page is dedicated completely to the first programmable device which I held in my hands. It was very long ago when I lived in Odessa Ukraine.  That time I experienced this calculator as it was built on a plat. I left it Ukraine when upon my leave for USA. The good thing that playing it, I could hold it in hand and move from one end of apartment to another, just like a cordless phone. But it was absolutely impossible to save programs, or introduce new features as its possible with an emulator. MK-61 was not the best perfect of programmable calculators of that time and place, yet not the worst.