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I got one of these, replaced the onboard battery, hooked up into the main battery plug with my bench power supply, and I am not able to get it to show anything on the screen, other than a long horizontal line that can move down the whole screen. I went through the technical manual and so far...

So, I made a serial null modem cable for my HX-20, as I wanted to test if the serial port was working. It seems like it is. Here's how I did that... I basically got a DIN-8 (full size) cable (I think they sell these for midi) and cut it in the middle, then stripped the wires back and used one...