Coin Slots

[codemonkey76]

I am building a cabinet and have a single coin slot. Is there a way to configure mame to accept a coin inserted for player 1 to be shared to player 2, 3 or 4. I am building a 4-player cab, but don't really want to require to have 4 coin slots?

Also I would like to be able to disconnect the coin door and have it so that would enable a shifted sequence to insert a coin, but have that sequence not function when the coin door is hooked up.

[Polemicist]

LOL. You are asking how to monetise your MAME arcade. Not really a thing that is legal technically. When it comes to multiple coin doors basically the coin mech is working as a switch. You could just wire all of the coin switches to that one mech. But in all honesty a coin mech is just a pretty thing to add to your cab and using it to make money out of MAME seems a little wrong don't you think?

[codemonkey76]

actually it will only be to collect coins from my daughters, they can spend their pocket money on video games and then i get to take it back and give it to them again, hahaha.

[Polemicist]

LOL. Cute.

[codemonkey76]

OK, but then 1 coin would put 4 credits in wouldn't it?

[Polemicist]

Technically yes. I've never tested that idea. Might be some info about it on the BYOAC forums?

[ghutch92]

Maybe use a dip switch?

[codemonkey76]

Maybe use a dip switch?

How would this work?

I thought one possibility would be to have a shifted function to insert coins for each player, i.e. hold player 2 button 1 and insert coin for player 2 credit, etc. Not sure how to set this up either, but think it's probably possible?

OR some type of rotary switch like a 4-position switch, switch it to what player you want to get the coin and then insert the coin?

Just spit-balling here.

[rfancella]

I setup mine to either use the push function of eject slot or the coin changer. Rigged up a spare button switch to it. Then ran the ground through a toggle switch. The wire switch at the bottom of the coin changer is always active. That way, you can either hit the eject button or put a coin in. If you hit the toggle, the eject doesn't work, but the coin still does.

Ron

[codemonkey76]

I setup mine to either use the push function of eject slot or the coin changer. Rigged up a spare button switch to it. Then ran the ground through a toggle switch. The wire switch at the bottom of the coin changer is always active. That way, you can either hit the eject button or put a coin in. If you hit the toggle, the eject doesn't work, but the coin still does.

Ron

hmm, my coin eject button doesn't have a switch associated with it

[Polemicist]

Actually a simple 4 pole switch would do the job pretty nice. Might be a little hard to blend it into the whole look of the machine but would work.

[MontyQ]

can't you just tab into the mame settings and set player 1,2,3,4 coin all as the same button that way when the coin inserted it triggers a credit for all four players ?

[rfancella]

hmm, my coin eject button doesn't have a switch associated with it

Mine doesn't either, I mounted a switch behind the eject plunger. When you press the left eject, it contacts the switch that I have wired to Coin 1 and the right eject switch is wired to Coin 2.

Ron

[codemonkey76]

also I have noticed that if i play games like mortal kombat / street fighter II, i can just press player 1 coin button (5) and credits can be used for either player, but games like bomberman need separate player 2 coin buttons etc.

[codemonkey76]

OK, I decided to to put insert coin buttons on the control panel and a toggle switch inside the cab.

With the toggle switch set to ON, the coin door will be active and inserting a coin will put a coin in for player 1, If Player 2 Coin button is held down, then inserting a coin will insert a coin for player 2, etc, etc.

If the toggle switch is off, then each insert coin button will be functional to insert a coin... This is how I plan on wiring it to make that happen, thoughts?

[Trnzaddict]

I think someone mentioned this before, but Why not just configure MAME to send a key combo credit? Like on my cab I have only 1 coin door and 2 players. I have coin 2 as pressing the player 2 button then inserting a coin. Simple.

There is like a small handful of games that require a separate credit press. Simple instead of a toggle switch imo.

[mono]

Interresting design

I think you would have to add diodes at least.

With the current design, false coin event will happen.

E.G. hold down P2 and insert coin will have following pathes:

GND -> Coin Door Toggle -> red -> Coin Door -> purple -> P2 -> pink ==> COIN 2

and

GND -> Coin Door Toggle -> red -> Coin Door -> purple -> black -> GND "juction" -> black P4 -> green ==> COIN 1

I guess it could work using a switch with 4 seperate connectors, so gnd lines are not connected to each other when Coin Door Toggle is "On"

Using online circuit simulation can be a great help in setups like these

http://www.falstad.com/circuit/

[codemonkey76]

Interresting design

I think you would have to add diodes at least.

With the current design, false coin event will happen.

E.G. hold down P2 and insert coin will have following pathes:

GND -> Coin Door Toggle -> red -> Coin Door -> purple -> P2 -> pink ==> COIN 2

and

GND -> Coin Door Toggle -> red -> Coin Door -> purple -> black -> GND "juction" -> black P4 -> green ==> COIN 1

I guess it could work using a switch with 4 seperate connectors, so gnd lines are not connected to each other when Coin Door Toggle is "On"

Using online circuit simulation can be a great help in setups like these

http://www.falstad.com/circuit/

Ahh, dammit you're right.

I actually tested this and had it working... before i added the toggle switch, which f's everything up...

any idea on how to add the toggle switch to this to turn off the coin door and just have the insert coin buttons function normally?

[MontyQ]

I think someone mentioned this before, but Why not just configure MAME to send a key combo credit? Like on my cab I have only 1 coin door and 2 players. I have coin 2 as pressing the player 2 button then inserting a coin. Simple.

There is like a small handful of games that require a separate credit press. Simple instead of a toggle switch imo.

yup that's what I said pages back lol its so simple takes seconds to do....

[rfancella]

CodeMonkey,

Here is how I have my 2 player coin door wired:

The P1 & P2 Coin are the "Insert A Coin" switches at the bottom of the coin mech. The Coin Door 1 & 2 are the switches I mounted to the eject buttons at the top of the coin mech.

So I wired the ground sides of both Coin Door 1 & 2 through a switch, so when you turn the switch on, both the Coin Door 1 & 2 become "live". The P1 & P2 Coin are always "live". The switch turns on and off the "eject button" switches ground.

EDIT: In effect, the P1 Coin and Coin Door 1 are wired in parallel, except the ground for the Coin Door 1 goes through a switch. The same would apply for P2, P3 and P4. All the Coin Door grounds wired through the same switch, then to ground.

All in all, I really like the effect. And when I eventually get real coin mechs, i'll have to re-mount the eject button switches.

Hope this helps,

Ron

[Min2001]

Go into Mame press tab key... goto Dip Switches\Coin Amount you can set how many credits are added there.

Ah nevermind others commented this before me.

[codemonkey76]

Will adding a DPDT switch fix it?

[codemonkey76]

Here's a better drawing, i have separated the switch and the coin door from the rest, because they will be part of the cab, with a 4-pin connector between the 2.

[Polemicist]

I thought a simple method would be to have the ground wire for all coin buttons pass through a single toggle switch. In one position the buttons close the circuit normally when pressed. In the other position you have to hold the button and insert a coin and the coin mech closes the circuit.

[codemonkey76]

I thought a simple method would be to have the ground wire for all coin buttons pass through a single toggle switch. In one position the buttons close the circuit normally when pressed. In the other position you have to hold the button and insert a coin and the coin mech closes the circuit.

closes which circuit though, I have one mech for 4 players?

diagram?