Donkey Kong and Donkey Kong Junior, both have designed into the boardset straps which can be cut and jumpered that will flip the screen 180 degrees from normal. Below are two hacks for DK. Donkey Kong Junior has a similar (but not identical straping structure).
The DK boardset (2boardset style) has designed into it a place that functionally would hold a SPDT switch. This switch either selects the standard flip signal, or the flip signal after it has been run through an inverter.
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In the corner of the CPU board and nearest to the white power interconnect connector locate a white rectangle with some jumper wires covered in yellow insulation. Look for the letters M and S In its factory state, the bottom most strap will be wired (shorted) and the strap above it will be empty (open) To flip the screen, these need to be reversed. Remove the bottom strap and move it up one notch. (actually if you want, only the left side of the jumper needs to be moved (the side label with the M. The side with the S can left in its original position as those two holes are connected. What Nintendo did with this design is create a space on the board that could hold a SPDT switch. The common connector of the SPDT switch would be on the side marked S. Thats it, next time you powerup your screen should be flipped! |
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You can also make this hack switchable if desired. I've not been able to locate a SPDT switch that fits. The easiest way to make the flip screen switchable is to install a small DIP switch, preferable a 2 position DIP switch. (See note further down about safety precaution when using a DIP switch to avoid short circuiting the boardset). First, remove the bottom most strap as in the hardwired instructions above. These 4 nearest pads (2 on each side) will be where the 2-position DIP switch mount. Remove the solder from holes that will hold the DIP switch. Solder in the DIP switch. Caution with this DIP switch configuration it is assumed that only one of the switches will ever be in the ON position, if more than one is place one, it will create a short circuit and could damage your board. The two switches control whether the screen is flipped or not. Basically these two switches form a SPDT switch. With SW1 ON, and SW2 OFF, the screen will be in its normal state. With SW1 OFF, and SW1 ON, the screen will be in a flipped state. |
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