The SIS3804 is a stripped version of the SIS3800 counter board. It is designed with experiments with a small channel count in mind. The control input section is identical to the SIS3800, the eight counter inputs are fed into the unit via a 34 pin header (ECL and flat cable TTL version) or via 8 LEMO connectors (NIM and LEMO TTL version) in the lower portion of the board.