Routines 
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The address of this routine is found in the table of addresses. It is called indirectly via fp_calc_2.
This subroutine handles the function ACS X and returns a real number from 0 to π inclusive which is equal to the value in radians of the angle whose cosine is X.
This subroutine uses the relation ACS X=π/2ASN X.


acs  3843  RST $28  X  
3844  DEFB $22  asn: ASN X  
3845  DEFB $A3  stk_pi_2: ASN X, π/2  
3846  DEFB $03  subtract: ASN Xπ/2  
3847  DEFB $1B  negate: π/2ASN X=ACS X  
3848  DEFB $38  end_calc  
3849  RET  Finished: 'last value'=ACS X. 
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