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Wiring 1 happ button to 2 keystrokes.

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whitiex:

i'm going to use 1 button for upper flipper/magnasave.  can i just have 2 NC wires going to the 2 different ipac inputs with only 1 ground?

PL1:

Yes, but only if you have separate inputs for the overlapping MAME/VP keystrokes. i.e. P1B1 (L-Ctrl) on a separate input from Left MagnaSave (L-Ctrl).

Normally, I recommend wiring it like the diagram below to use fewer inputs.



If you're using 2-terminal buttons for MAME (Goldleaf, Seimitsu, Sanwa, leaf switches, etc.) you can ue diodes like this to isolate the MAME switches from each other while allowing Upper Flipper/MagnaSave to apply ground to both inputs.




Scott

EDIT: Updated picture to show two switches for Upper Flipper/MagnaSave wiring.

whitiex:

so wire the mame buttons backwards using the gnd as positive NO as gnd?  is the pinball NC connected to anything?

how about wiring 2 buttons in 1 input for the flippers?

thanks for your help

PL1:


--- Quote from: whitiex on March 05, 2014, 07:35:12 pm ---so wire the mame buttons backwards using the gnd as positive NO as gnd?  is the pinball NC connected to anything?

--- End quote ---
For some reason, people have it in their heads that the Common (COM) tab is always and only ground. (I still need to edit a few pages of the wiki that contain this myth.)

From an electrical standpoint, that is the same as saying that a piece of wire has a positive and negative end -- total BS.   :soapbox:

Most arcade wiring does use the COM tab to connect the ground wire, which ensures that the NC terminal will only have ground on it in case a loose wire happens to come in contact with it, but it's not the only way to connect things.


--- Quote from: whitiex on March 05, 2014, 07:35:12 pm ---how about wiring 2 buttons in 1 input for the flippers?

--- End quote ---

The NC from both MAME buttons goes to the pinball button input using a Y-connector like this.



With the "backward" wiring, when you to press one MAME button, the COM  lever is moved from NC (connected to flipper) to NO (ground) which keeps you from grounding both MAME buttons at the same time -- same trick that's used for KADE Extended Mode.

When you press "Up", only the up input is connected to ground.

When you press "Down", only the down input is connected to ground.

When you press "P1 U+D", both the up and down inputs are connected to ground.

Wire the MAME buttons like "Up" and "Down", and the Upper Flipper/Magnasave like "P1 U+D"




Scott

PL1:

Updated pic for greater clarity.

I shoulda' knowed something was missing -- thanks for asking.   :cheers:


Scott

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