So the wife and I really enjoy playing games together, and there are some really good multi-player console games in the retropie library. I was wondering this morning if there would be a configuration possible where I could still use the game boy dmg as a portable, with a conversion process to still be able to easily plug in to a television for multi-player events? Thinking the best way right now would be to hide the ports needed behind a hollow compartment where the game boy games go. A couple of neodymium magnets could hold the game in place while allowing ports to be opened up that could be plugged into easily. This requires that the monitor and pi be able to fit in the case sandwiched, with enough room for ports. I would need at least one USB port, the HDMI, and the USB power in to be able to do this, with an added cutoff function for the battery pack when the pi is plugged in to the micro USB power source.

     I could manage an auto kill for the battery pack with transistor gating, with the positive voltage across the transistor from the micro USB line causing current to not be able to flow from the battery pack, but I would feel a lot more confident with a mechanical cutoff switch. Possible one that mechanically blocks a port when in one position and only allows the battery to supply power when the port is closed off to basically dummy proof it. Only need one failure to fry the board. I'll have to think more on this and the configuration of ports. I could probably desolder the micro USB , but I don't believe I would have as much luck with the HDMI port. Ill have to look into how I can fit the Pi into the casing too. If i can fit it in sideways, that would be best because the HDMI connection is centered almost on the board, which would be easier to arrange for the game cartridge to cover. It would probably have to be raised off the shell bed as well to allow enough room to plug in. I can always glue some small wood bits on to mount the Pi onto. I need to find a way to isolate it from the monitor backing as well to prevent shorts. I could maybe use the magnets holding the cartridge in place to control a reed switch for a failsafe? Or have the edge of the cartridge push the switch down, enabling the battery supply. I feel the reed switch would be prone to killing power accidentally with shaking or impacts so let's just toss that idea out now while we're still ahead.

     I really like now that I got a small video driver board with this screen because even attached to the monitor the whole thing is still pretty slim. Added to the fact that its so tightly sealed to the screen that I am worried about circuit damage with the amount of force I would have to use to remove it I really don't want to chance it. I'm thinking that a manual switch that the cartridge forces to be in one position when in the game boy alongside a kill switch in the side of the slot for the cartridge that is only closed when a cartridge is pushing against it to enable the battery, and then on top of that the usual power switch on the game boy in line with battery power should be sufficient to prevent one power source from being activated while another has the capability to be present. I'll mock up a circuit diagram later because I haven't gotten to wiring the power sources with the power-boost 500 basic and lipo charger circuit yet. One thing at a time.