Abstract: An asynchronous FIFO incorporates a series of interconnected cells alternately oppositely inverted to provide forward and retrograde data paths, so as to selectively establish virtual flip flops as needed at interfaces between cells. Each cell combines an inverting amplifier for data, switch structure and a binary control for the switch structure to provide the data path. The controls are interconnected in a sequence along with logic to set the state of each control according to an instruction: copy the state of your predecessor in the sequence if the states of your predecessor and successor differ, otherwise hold your present state.