Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Important Notice
The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
FPATAN/FPTAN Instructions
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────────────────┬─────────────────────────┬─────────────────────────────────
 FPATAN         │ fpatan                  │  87 250-800
                │                         │ 287 250-800
                │                         │ 387 314-487
                │                         │ 486 218-303
────────────────┼─────────────────────────┼─────────────────────────────────
 FPTAN          │ fptan                   │  87 30-540
                │                         │ 287 30-540
                │                         │ 387 191-497*
                │                         │ 486 200-273£
────────────────┴─────────────────────────┴─────────────────────────────────
  * For operands with an absolute value greater than pi/4, up to 76
    additional clocks may be required.
 
  £ For operands with an absolute value greater than pi/4, add n clocks
    where n = operand / (pi/4).
                                    -♦-