I am trying to interface a device to a PDA (Palm OS). This device does not have an external interface but it does display its output to an 8 character 5x7 matrix LED display. The display is connected to the main board by 6 connections. My idea was that I could read the data being sent to the display as the output of the device. There are part numbers on the display but I don't have them right now and I don't know if they would help or not. Will this approach work? How complex of a circuit will I need to read the display input and write it to the PDA's serial interface? Will I need an oscilloscope to try to determine which input lines to the led do what function? Thanks for any input!