COSMAC
The SK74LS93 is a high speed 4-bit binary counter produced by RCA for the COSMAC series of computers. It is a high-performance, low-power device designed for precise applications. The SK74LS93 contains an asynchronous reset, four clock inputs, four count enable inputs, and four outputs. It also has an internal counter section that can be used to count up to 12 clocks. The design also includes a prescale function so that it can count at slower speeds. The SK74LS93 is used in applications where precise control of the timing of operations is required.