so, there's this 'color pong' game out there for 83, and it doesn't work on 84s. It apparently messes with those you'd-be-well-advised-to-just-leave-this-alone commands for LCD port $10. I've never seen it run on an 83, but it supposedly gets you some yellowish and bluish colored pixels for an otherwise ordinary pong game. If you try to run it on an 84, however, this funky pattern happens in the upper left corner of the screen, and then it kinda flickers and fades. After doing this, the calc is still on, but the screen doesn't work, until you reset it (i can navigate the menus blind!)

Inspired to mess with the port after seeing the thread on the exclusive flipping commands, i replicated the color pong affect by sending $10 to the port (i haven't tried the other power supply instructions yet)

Does anyone know what in the heck $08 - $13 do to the LCD? is it harmful? and should i pursue a further study of these commands?

I tried this on my 83+SE and it just turns off the LCD until I turn the calc off/pull a battery. Maybe it doesn't work at all?

http://calcg.org/cgi-bin/files.cgi?id=1471
Well, it's still here (link c/o Flygon)

yeah, i just took a look at the hex code and all i found relating to the LCD were these:
D310CD <- low contrast
D3103E <- isn't supposed to do anything according to WikiTI
D310EF <- high contrast

but i still don't understand.... the weird effects on the screen it created were consistent with messing with the power supply!

Could you post pics of it in action, as proof? On my regular 83+, it looked a bit colored, but very barely. The black was slightly blue-ish, but more close to black, while the white looked close to brown/yellow. I could barely see anything. It's not my calc that isn't compatible I am sure, because my calc hardware is from July 2000, long before the program was made.

Otherwise we could pretty much say that The Reign Of Legends 2 Totem dungeon features colors as well.