ETX, standing for Embedded Technology extended, computer-on-module (COM) is a highly integrated and compact (3.7 x 4.4 in.) (95 x 114 mm) Single-board computer (SBC) that can be used in a design application much like an integrated circuit component. Each ETX COM integrates core CPU and memory functionality, the common I/O of a PC/AT (serial, parallel, etc.), USB, audio, graphics, and Ethernet. All I/O signals as well as a full implementation of ISA and PCI buses are mapped to four high density, low profile connectors on the bottom side of the module.

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The filename extension for setext files, which are straight text files in a specific format that's easy to read online and can be decoded for even better display.