HP 7090A Measurement Plotter - LCD Segment Test

I grabbed a Huzzah32 to hook up the LCD and test/identify the segments - Here you can see that some segments come through nicely and some are faint. I'm still not convinced that the issue is with the LCD itself, not the MC145000P controller chip. Anyway, I now have an XLS with the segments in it so I can start working on reading the data from the plotter before moving on to displaying it on a new display.