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The rom check is something LSDJ does the first time the cart boots. My guess is that some issue only affecting higher sectors (like a bad sector, or possibly pins becoming desoldered or something). LSDJ is one of only a few roms that use 1mb flash storage, and the only one I know of that actually attempts to verify the rom image.

Was the rom you flashed the one from here? https://catskull.net/erase-an-ems-64-us … -cart.html

You could try flashing that rom, then dumping it again and comparing the roms in a hex editor to make sure it's all 1's and no 0's. You could also do the same thing but change the rom to write all 0's and do the same thing. My guess is somewhere near the end of the dumped rom, you'll see bad data.

I have compiled mGB from source to just 32k. It removes the SRAM functionality, and also the color scheme (it's just greyscale). It's what I include on my mGB carts. Here's the rom if anyone else wants it: https://drive.google.com/open?id=0B2JWZ … XBPZTkyVDg

sounds like xyce to me, not sure which track

Wow, that's actually super cool. Not an LCD, but leds and a few 7 segments!

Couple general debugging steps:
- Is the teensyboy in mgb mode? You change modes by pressing the little silver button near the edge until the light labelled "mgb" flashes.

- Which link cable are you using? Is it the green one you got from me?

- Are you sending midi data on channel 1-4? The green light flashes on any midi data, but mgb won't respond to it. The one of the red lights will flash if you're sending data on the right channels.

Also check out this video for setup info: https://youtu.be/tlo4joa_kis

lowest!

Ah nice! Looks like no prime shipping but still a good deal. I played through about 1/3 cave story the other night and overall I just really like the handheld.

If you buy one I'd recommend putting the firmware on the internal SD card. Mine came with a 4gb card that is what the firmware needs. Then just put your roms and music on the external card.