System Modules (originally known as System Building Blocks; the name was changed around 1961) are a DEC modular digital logic family which preceded the later FLIP CHIPs. They connect to the units they are plugged into via a set of 22 gold-plated discrete pins along one edge. They were available in several compatible speed lines: * 4000-Series: the second series, nominally 500 KHz, but some 1 MHz * 1000-Series: the original series, nominally 5 MHz * 6000-Series: higher speeds, nominally 10 Mhz * 8000-Series: very high speeds, nominally 30MHz
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