Changes

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=|none]]

Initially hooking up the JTAGulator to the Kenwood TH-D74 amateur radio the JTAG pinout was not discovered. I figured perhaps the port I identified was incorrect or there may have been components removed disabling the JTAG port. I soldered wires to a completely different device that I verified with the components datasheet had JTAG and was indeed connected to the port I was using. Again, the JTAGulator did not identify the pinout.