A programmable logic device having one or more programmable logic regions and one or more conventional inputoutput regions additionally has one or more peripheral areas including specialized circuitry. The cache is maintained in both a primary and secondary node. The at least two terminal sets may include a first terminal set configured for engagement along a first axis to a battery pack having a first configuration and a second terminal set configured for engagement along a second axis to a battery pack having a second, different configuration. The frangible wall portion is operable to be broken from outside the enclosure method.