A display controller is provided which can control the display of a fast moving image with higher quality in an active matrix display apparatus DD. A ported valve plunger sliding in a sleeve admits water from the inlet to the spout in one position while a lower O-ring seals the spray outlet. The system serialization capability includes a diagnose instruction which is issued after the host acquires a lock, eliminating the need for the guest to acquire the lock. The groundplane is configured as to extend between the radiating points and the feedlines are widened at the radiating points andor are provided with discrete dielectric elements at the radiating points.