A method to perform an adaptive test performs a pressure sensitivity test to examine a pressure sensitivity of a solver to time, and judges, based on a result of the pressure sensitivity test, whether or not the pressure sensitivity of the solver is equal to or higher than a predetermined threshold. The above embodiment achieved the result by distinguishing both queue types and slot style types, and performing selections differently depending upon the relative styles of the queues and slots. A sealing glass bonds the overlying layers to the base plate. A value parameter associated with a prepaid instrument, such as a prepaid calling card, is decremented by an amount corresponding to the value provided by the merchant. One embodiment of the method comprises the steps of receiving a single instruction, and performing multiple PSAD calculations in response to the single instruction.