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MATHS CO-PROCESSOR REFERENCE->FDBNGL

FDBNGL     Test if Not Greater than or Not Less than, Decrement and Branch

If Not Greater than or Not Less than then no operation, else Dn - 1 -> Dn then
if Dn not equal to -1 PC + d -> PC
else execute next instruction

Assembler Syntax: FDBNGL Dn,<label>

Attributes: Unsized