The OEC hardware is Arduino-based and in our case, we’ll be using this to interface with an emulated mainframe running on a Raspberry Pi 4. In this post, we now take a look at a rather neat open-source implementation of an “establishment controller” which is used to interface a 3270 series terminal with a mainframe. In a previous post, we took a fresh look at IBM 3270 and noted how this family of terminals is particularly interesting, working as part of a highly integrated system that allowed a mainframe computer to scale and serve thousands of users. Building the Open Establishment Controller interface and using this to connect a 3270 terminal to an emulated IBM mainframe running VM/370.
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