* The ENPUP_NTRAILER packet types starting at ENPUP_TRAIL have
* (type-ENPUP_TRAIL)*512 bytes of data followed
* by a PUP type (as given above) and then the (variable-length) header.
* The ENPUP_NTRAILER packet types starting at ENPUP_TRAIL have
* (type-ENPUP_TRAIL)*512 bytes of data followed
* by a PUP type (as given above) and then the (variable-length) header.