The Mysterious Mishaps of Mr. Do!

Samuel-IGN

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I have a Mr. Do's Castle that works perfectly. I recently bought a Mr. Do! board, slapped it in the machine and got some wacky results. It plays perfectly, but:

1) The game is unplayably "dim". See images.
2) The sound is garbled, with incorrect tones blaring loudly over what I can barely discern to be the correct tones, which are much lower.

Images attached include:

1)"Before" with Castle
2)The Castle setup, note the Atari power supply
3)"After" with dim Do!
4)The Do! board

I've always understood these boards to be 100% swappable. What gives? Are there different versions of the Mr. Do! board out there?

Universal fans, I need your wisdom. I'm more curious than anything else. I can stick with Mr. Do's Castle forever as far as I'm concerned, but I'd love to be able to swap the boards.

PS: Also, how much of a bummer is it that you cannot perform a search for "Mr. Do!" on the Arcade Forums?
 

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have you checked the pin mapping and metered the power?
I could imagine that some boards may react differently to different levels of voltage.
 
Have you measured your voltages on both boards?

Boards have differing current draws and the Mr. Do may be pulling your +5V (or another voltage) low or worse is that the voltage ends up too HIGH!
 
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