Routines 
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The address of this routine is found in the table of addresses. It is called via the calculator literal +28 by the routines at CD_PRMS1 and asn. It is also called indirectly via fp_calc_2.
This subroutine handles the function SQR X and returns the positive square root of the real number X if X is positive, and zero if X is zero. A negative value of X gives rise to report A  invalid argument (via to_power).
This subroutine treats the square root operation as being X**0.5 and therefore stacks the value 0.5 and proceeds directly into to_power.


sqr  384A  RST $28  X  
384B  DEFB $31  duplicate: X, X  
384C  DEFB $30  f_not: X, (1/0)  
384D  DEFB $00  jump_true to LAST: X  
384E  DEFB $1E  
The jump is made if X=0; otherwise continue with:


384F  DEFB $A2  stk_half: X, 0.5  
3850  DEFB $38  end_calc  
Continue into to_power to find the result of X**0.5.

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