Overflow above the 40th bit of the register MR2 should not be allowed. The sign of number is lost forever thus and saturation can receive absolutely opposite result. But more than 255 simple perepolneniye (type MV) that such could happen are required.
Thus it turns out that carefully thought over realization of algorithms of arithmetic operations and circuit decisions conduct to increase in speed of the central processor and, as a result, receiving more ample opportunities of work with information.
The mode gets out in the 4th bit of the register of the mode and state (MSTAT). Unit in this bit means the integer mode; zero means the fractional mode. In both modes contents of the register P move on an entrance of the adder which adds or subtracts new work from the current contents of the register MR to create final result in R.