TDCALL_RETURN_CODE
if (TDCALL_RETURN_CODE(ret) == TDCALL_INVALID_OPERAND)
else if (TDCALL_RETURN_CODE(ret) == TDCALL_OPERAND_BUSY)
if (TDCALL_RETURN_CODE(ret) == TDCALL_INVALID_OPERAND)
if (TDCALL_RETURN_CODE(ret) == TDCALL_OPERAND_BUSY)