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Single Slot Coin Door dilemna

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Slippyblade:
You would need to be using a 4 player encoder or have your keyboard/gamepad hack ready.  These diagrams assume a common ground.  With this setup if you dropped a coin without having a button down NOTHING will happen.

PL1:
Not sure I get how things will work with your proposed setup, Slippy.

Seems like you'd need a boolean logic setup similar to this diagram with two AND gates, with one input inverted/negated.

(Yeah, I know the actual signal levels will need to be reversed for the typical active low encoder -- I'm just tracing the basic logic/timing here for a single player position.)

The problem that I see is that you will need to press and hold P1 Start before dropping in a token since the coin slot will only provide a momentary "1" on the blue line.

This will cause the encoder to output this sequence:

- P1 Start (Player 1 Start pressed and held, coin switch is open) - Red 1, Blue 0

- P1 Coin (Token momentarily closes coin switch) - Red 1, Blue 1

- P1 Start (Coin switch is open again, output continues until Player 1 Start button is released) - Red 1, Blue 0

Even if you dropped the top AND gate and took the red input straight to the encoder, you'd still always get a P1 Start while coining up.

Am I missing something here?


Scott

Slippyblade:
The start switches aren't used, only the player COIN switches.  Think of the default MAME setup.  the '5' key is player 1 coin and the '1' key is the player 1 start.  so the button in this case would be wired to the player 1 coin input, NOT the player one start input.  You would still need to press the player 1 start after dealing with the coin slot and coin button.

Like I said, not my preferred method.  I'd either use 4 coin slots or just use coin buttons by themselves.  The OP is wanting some way to make a single slot coin mech work for 4 players.

Zzap:
Having multiple credits from 1 coin doesn't have an effect on gameplay too much. In fact in quite a few games player 2 coin gives multiple credits to the single credit counter in the game anyway.

PL1:
The way the original post was phrased, it didn't sound like he was planning on having four coin buttons on the CP.   :dunno

If there are buttons for Coin 1 thru Coin 4 on the CP why the  :censored:  would someone bother with a circuit like this instead of just wiring Coin 1-4 to the associated encoder inputs and wire the coin slot in parallel with the (most often used) Coin 1 button?   :dizzy:

Another option that makes sense is to wire Coin 1 thru Coin 4 buttons to the encoder and wire the coin switch to all 4 encoder inputs using one diode per input (band toward the coin switch) so one coin drop gives you Coin 1 + Coin 2 + Coin 3 + Coin 4.  YMMV.


Scott

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