Routines 
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The address of this routine is derived from an offset found in the scanning function table.
Unless syntax is being checked the value of 'PI' is calculated and forms the 'last value' on the calculator stack.


S_PI  2627  CALL SYNTAX_Z  Test for syntax checking.  
262A  JR Z,S_PI_END  Jump if required.  
262C  RST $28  Now use the calculator.  
262D  DEFB $A3  stk_pi_2: The value of π/2 is put on the calculator stack as the 'last value'.  
262E  DEFB $38  end_calc  
262F  INC (HL)  The exponent is incremented thereby doubling the 'last value' giving π.  
This entry point is used by the routine at S_RND.


S_PI_END  2630  RST $20  Move on to the next character.  
2631  JP S_NUMERIC  Jump forward. 
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