Abstract: A ballast water treatment system for treating ballast water for a vessel has a pathway for navigable raw water to the tank and a discharge for discharging water back to the body of navigable raw water. A back washable filter in the pathway receives the raw water and screens sediment from the raw water to produce initially processed water which contains at least some marine organisms. A UV or other biocidal device is connected between the filter and the ballast tank, for disabling or killing the marine organisms in the initially processed water to produce treated ballast water for the main outlet to the ballast tank.

Abstract: A memory accessing control for a microcomputer system is compatible with both static and dynamic type memories. A gating circuit is responsive to read/write and address latch enable control signals of a microprocessor, and provides an enable signal utilized to generate a chip enable signal compatible with the timing and control requirements of both dynamic and static memories.