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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/2-ASN X.
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| 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 X-π/2 | ||||||
| 3847 | DEFB $1B | negate: π/2-ASN X=ACS X | ||||||
| 3848 | DEFB $38 | end_calc | ||||||
| 3849 | RET | Finished: 'last value'=ACS X. | ||||||
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