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http://chipmusic.org/forums/post/42998/#p42998

I'd say http://nocash.emubase.de/gbatek.htm#sionormalmode + 8-bit mode sounds like a better idea. The main problem is 5V vs 3.3V compatibility, and I'd guess that you'd encounter the same problems whether you are using general purpose mode or "normal" serial mode.

One problem however, is that GBA can't send data at any lower rate than 256 KHz in GBA mode. That should be just fine with a DMG, but perhaps the high speed combined with the low voltage will make the transfer unstable. If you look at the DMG schematic, you'll see that all the serial port pins hove some input prtection circuitry, including a 100 pF, which might bite enough away of the rising edge of the data that the tranfer (sometimes?) fails.

My recommended procedure is:
1) Try the "normal" mode in 8-bit mode with GBA as master.
If that's not stable enough...
2) Try "normal" mode in 8-bit mode with GBA as slave and DMG etc as slave.
That should work stable, but you obviously can't be master. So you can...
3) Try emulating the serial protocol  in "general purpose" with a much slower speed. DMG's master mode is 1 kbit/s, for comparison. A few kbit/s should be no problem for the DMG, but if 1) didn't work, you know 256 kbit/s is far too much.

Gambatte, ne!

Why haven't I replied here yet?

Any voltage in the range 5-7 V DC will work fine. The trick is to find one with the right size that is also DC and center negative. If you find a plug of the right size, you can always repurpose it with a suitable transformer.

The hum is annoying but ultimately harmless. Unless you're recording and want a clean sound, of course.

Bump! Rolf, has this project progressed?

Probably not "glitch out" in any meaningful way, more like the play field is inverted but sprites and score/lives area is not, or something like that. Or that the screen is supposed to flash but doesn't. (Think: Defeated boss and such.)

You are 20 minutes late. Check the tweet!

OK! Let's try and be funny here!