A Fresh Look at IBM 3270 Information Display System
Summary
This DesignSpark article provides a historical overview of the IBM 3270 Information Display System, explaining how its data stream and display architecture enabled a mainframe to serve thousands of users. It covers physical interfaces (RS-232, coax) and the shift toward tn3270 emulation, and highlights hardware like the 3174 Establishment Controller and 3179 display, including open hardware projects that enable modern experimentation. The piece underscores the ongoing relevance and preservation of legacy mainframe technologies.