4-bit binary counter A p736 (= 46 * 2^4) gun based on 4 boat-bits which form a binary counter. (A boat-bit is a memory device in which a bit of information is represented as the presence or absence of a boat adjacent to a snake (or eater or beacon or ...). Hitting the boat-bit with a glider changes its state. The transition from 1 to 0 can be detected by another glider.) Dean Hickerson, dean@ucdmath.ucdavis.edu 2/9/90Xref: memory