This afternoon I’ve been working on the coin mechanism for my Mame arcade machine.
On my Phoenix cabinet, the coin mechanism is all mechanical. As the coin travels through the mechanism, it rolls past and pushes a metal bar which in turn is connected to switch that registers a credit. As the switch is nothing more than a standard microswitch, it was really easy to simply connect this to the coin terminals on my ipac to allow for it to work in Mame.
However, moving over to this second cabinet, the coin mechanism is an all electronic affair and at fIrst, I didn’t think I could do anything with it…other that fabricate the same sort of metal bar/switch setup at the exit of the coin chute.
As always, the Internet is full of useful tips and after finding videos and documentation for this type of coin door, I thought I’d have a go at wiring this to my PC.
Mars MS coin mech….I’m not sure if this is a model 111 or 102 though.
The control board requires a 12v feed therefore i’ll supply this via my PC’s 12v line taken from one of the spare Molex HDD power sockets. To make it easy when disconnect the coin mech, say for example If I need to bring the PC into the house, I’m going to use a spare 4-pin molex to SATA extension cable I have in my spares.
The SATA end won’t be needed though, so this gets the snip.
I’ve taken the the 12v and ground feed from the coin mech and attached it to the PC cable via a simple termination block.
I’ve also taken the two wires from the credit terminals and wired the positive to the ‘coin’ input on my IPAC and the other to the IPAC ground wiring loom. Originally I had the coin button wired to the Player Two Start button on the Control Panel, but I’ve now returned it to it’s proper function – Two Player Start.
Should I need to bypass the coin door, in the event of being caught short of coins, I’ve found a handy IPAC shortcut sequence in Mame to simulate a coin insert – Basically you hold down one player start button & press fire button number 1….man, you’ve gotta love the shift key functions on these IPAC’s!
All good to go for testing and so I thought I’d make a quick video as I went along.
I’m quite pleased with how it turned out and will have to experiment more with the DIP switches to see what they other settings do. Certain coins that are shiny new don’t seem to work as well as older coins, maybe the reflection messes around with the coin validator?
Next I want to remove both of the doors, disconnect the mechanism, chute and locks, give them a rub down to get rid of the flaking paint and apply a fresh coat of Hammerite Black paint to make them look all new again.
That’s about all I got done this afternoon as I called my older brother and nephew on the phone to see if they fancied popping around to give my cab a play test. My nephew is a modern COD, Xbox PS3, sorta player but he was getting quite into Metal Slug and it was so cool to be playing side by side with my older brother once again, just like we did back in the old days with 2-up classics like Salamander, Double Dragon and Bubble Bobble.