Science Fair Project Encyclopedia
The MK-61 is one of the most powerful (non-BASIC) Soviet calculators ever manufactured; it had a Cyrillic keyboard and was also an RPN calculator. It is identical to the MK-54, but the MK-61 is programmable capable of accommodating 105 steps and 15 registers. Production started in 1983 and finally stopped in 1993.
Original price: 85 rubles
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