The LCU-64, which is short for “Launch Control Unit – 64 Pads”, is the full system brain. It is a launch controller capable of individually controlling up to 64 separate pads. The controls of the LCU-64 are subdivided into 8 banks of 8 pads each. The communications from the LCU-64 to all the pad boxes run thru two wires. You select which bank you want to fire A thru H, then you select from between one to eight of the pads on that bank to fire when you push the FIRE button. The system tells the LCO if an igniter is good or bad but even with a false “bad” (some home-made igniters will read “no-continuity” at the LCU-64 and still work) the system will automatically “fire” every pad that is selected. The LCU-64 will only operate one bank at a time as a safety feature. If two banks are selected at the same time, the LCU-64 will send NO fire commands, period. The LCU-64 is designed to work with up to 8 PBU-8’s or up to 64 PBU-1’s or any combination of PB-8’s and PB-1’s. (BTW-If you really want to get crazy… with the addition of a single A-B switch the LCU-64 could control 128 separate pads).