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   ◄Summary►  ◄Timings►
────────────────┬─────────────────────────┬────────────────────────────────
 FXAM           │ fxam                    │  87   12-23
                │                         │ 287   12-23
                │                         │ 387   30-38
────────────────┴─────────────────────────┴────────────────────────────────
 
Condition Codes for FXAM
 
C3    C2    C1    C0    Interpretation
0     0     0     0     + Unnormal *
0     0     0     1     + NAN
0     0     1     0     - Unnormal *
0     0     1     1     - NAN
0     1     0     0     + Normal
0     1     0     1     + Infinity
0     1     1     0     - Normal
0     1     1     1     - Infinity
1     0     0     0     + 0
1     0     0     1     Empty
1     0     1     0     - 0
1     0     1     1     Empty
1     1     0     0     + Denormal
1     1     0     1     Empty *
1     1     1     0     - Denormal
1     1     1     1     Empty *
 
*  Not used on the 80387. Unnormals are not supported by the 80387.
   Also, the 80387 uses two codes instead of four to identify empty
   registers.
                                    -♦-