High Quality Content by WIKIPEDIA articles! ETX, standing for Embedded Technology eXtended, is a highly integrated and compact (3.7 x 4.9 in.) (95 x 125 mm) computer-on-module (COM) form factor 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.