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Since it does not use graphical widgets, only plain text, but offers comparable functionality to a GUI with a tiling window manager, it is referred to as a Text User Interface or TUI. For a short introduction, see the 2nd paragraph on page four of the first published Report on the Oberon System.cite-ref-4[4]

Oberon's UI influenced the design of the Acme text editor and email client for the Plan 9 from Bell Labs operating system.

Modern embedded systems are capable of displaying TUI on a monitor like personal computers. This functionality is usually implemented using specialized integrated circuits, modules, or using FPGA.

Video circuits or modules are usually controlled using VT100-compatible command set over UART, FPGA designs usually allow direct video memory access.

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