So I've been using my flash cart on my US Duo for the past month or so since I got it.
Over the weekend I decided to try it out on the core TG-16 (no CD-ROM) I have in my bedroom since I was feeling especially lazy and it sounded good to play a little TG-16 while laying in bed. It doesn't work. I mean, it boots to the blue screen but all the games crash as soon as you start them. Some crash before even making it to the title screen. Some crash on the title screen. The TG16 in question is unmodified internally, although I have a custom-built connector hooked up to the expansion port that pulls composite video and stereo sound straight off the pins back there. I can't fathom how this could possibly have any effect on the flash cart, but there you have it.
My first thought was maybe the flash cart's pins had gotten dirty. No, they are fine. Next I thought maybe somehow it's memory got corrupted so I took it back to the Duo. Nope, on the Duo, everything works 100%. I even played into the English version of Bubblegum Crash for like an hour and a half on the Duo and it worked without a hitch.
My next though was maybe the pins inside inside the cart port on the TG-16 are dirty. So I tried like 60 real HuCards I had on hand and every single one booted fine, first try. I've had this TG-16 for many years and I've never had any trouble like this before.
Has anyone else had any difficulty using these carts on core TG-16s without CD-ROMs?