I probably do have that somewhere, maybe, but not entirely sure where, nor do I even know when I'd get a chance to look. If I ever do run across it I'll be sure to snap a pic and add it here. I'm not really sure why I never did back then
It's been a long time since I worked on any of this stuff but I seem to remember the + voltage from the batteries going to the backlight first before the regulator. So the backlight gets full voltage and the rest gets +5 from the regulator. That should be easy enough to test. Or maybe I'm remembering the Lynx...as I was working on one of those around the same time. Again, maybe best for someone else to say for sure since these memories are running on fumes.