The very earliest famiclones, usually made in Taiwan, were a more or less exact copy of the original hardware, using cloned chips usually manufactured by UMC. However, later famiclones produced since the mid-late 90s usually incorproate the entire system into a single small chip, known as a NES-on-a-chip (NOAC) design, which is much cheaper to produce and much smaller (allowing for more creative and compact console designs) but less faithful recreation of the original console, leading to compatibility problems.