Operation

C1 sign bit of ST; (* 0 for positive, 1 for negative *)

CASE (type of object in ST) OF
Unsupported: C3, C2, C0 000;
NaN: C3, C2, C0 001;
Normal: C3, C2, C0 010;
Infinity: C3, C2, C0 011;
Zero: C3, C2, C0 100;
Empty: C3, C2, C0 101;
Denormal: C3, C2, C0 110;

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