Soviet Programmable Calculator MS-1103 - basic operations
It is a desktop version of the first handheld programmable calculater in USSR (B3-21), with memory for 66 program steps and about 10 data registers. I show how basic operations (like addition) are performed on X and Y operational registers (X is one shown on display and Y is invisible, but they could be swapped with swap button). Then we try to create and execute simple program for calculating length of vector by its 2D coordinates - e.g. calculate formula SQRT(X^2 + Y^2).
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