-1:Abnormal termination.
-2:Not enough memory.
-3:Reference to NIL pointer.
-4:Integer overflow.
-5:Divide by zero.
-6:Real math overflow.
-7:Real math underflow.
-8:Value range error.
-9:Case value range error.
-10:Non-zero IORESULT -- 
-11:Segmentation violation.
-12:CPU bus error.
-13:Illegal CPU instruction.
-14:CPU privilege violation.
-15:Bad argument - SIN/COS.
-16:Bad argument - Natural Log.
-17:Bad argument - SQRT.
-18:Bad argument - real/BCD conversion.
-19:Bad argument - BCD/real conversion.
-20:Stopped by user.
-21:Unassigned CPU trap.
-29:Misc float card error (bad operand?).
-30:System error -- 
-31:Calls to RELEASE and MALLOC are incompatible.
-32:Heap operations out of sequence.
-33:Illegal variant on dispose.
-34:Heap manager range overflow - currently limited to 24 bit addresses.