The document discusses the rise of minicomputers in the 1970s-1980s as the third epoch in healthcare IT history. Minicomputers like those produced by Digital Equipment Corporation (DEC) were much smaller and less expensive than mainframes, making clinical and financial systems affordable for medium and small hospitals for the first time. Pioneering vendors developed turnkey software packages that were pre-installed on minicomputers, solving issues of cost, ability to implement clinical systems, and ease of installation compared to prior generations of mainframe computers. A wide variety of minicomputer manufacturers entered the market in this period, driving innovation but also creating issues from a lack of interoperability between different proprietary platforms.