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rom hacks to support 2 buttons with genesis controllers


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  • 2 weeks later...
On 1/23/2020 at 7:58 PM, dr. kwack said:

Any chance my Ghostbusters II hack could get the 2 button treatment? It would make selecting weapons easier than using the switch.

newghosts1.bin 16 kB · 5 downloads

this really could benefit from 2-button control to have the 2nd button cycle thru weapons, bypassing the vcs selector swich- plz somone put this one on yr to-do list!  the game will be as improved as it can get if this happens!!

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  • 1 month later...
On 1/17/2020 at 4:36 PM, Thomas Jentzsch said:

No idea (I would have to look up how to program that, reading INPT1 I suppose).


But what would you want to put on the 3rd button?


I'm looking at it as a multi use controller. 2 button use on the 7800 and 2 button use on the 2600.

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  • 3 years later...

Not without modifying the controller or building an adapter.

You need to add a 10k resistor between pin 7 and pin 9 of the plug to allow the Atari 2600 to detect the second button. Unfortunately, pin 7 is not wired at all in a Master System controller. So you either need to also replace the cable, or build a little pass-through adapter and place the pullup resistor there, like this:


Edited by alex_79
added adapter schematic
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  • 2 months later...
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  • 3 months later...
53 minutes ago, Stechmann said:

Will these hack work with the CX78 controller?

No, genesis controllers operate completely differently than CX78. Similar hacks can't be made for CX78, because the 2600 lacks the circuitry required to read CX78 buttons independently. (and a 7800 in 2600 mode has this circuitry inactive)


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