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The [http://www.grandideastudio.com/jtagulator/ JTAGulator] is an open source tool to help find On-Chip Debugging (OCD) interfaces. Designed by [[Joe Grand]] of [http://www.grandideastudio.com/ Grand Idea Studio] it can be used to find JTAG ports and UART's on embedded devices.
[[File:JTAGulator and Kenwood TH-D74.jpg|thumb|JTAGulator connected to a Kenwood TH-D74 to determine JTAG pinout|alt=|left]]