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LED credit display

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rdagger:
I think all you need to do is have a circuit that increments the dual 7 segment display when a quarter is inserted and decreases the counter when any of the Player 1-4 buttons are pressed.  I would do it with an AVR ATTiny2313.  1 chip and and a resistor array is all you would need.

You could power the circuit from the IPAC and use the NC pins on the microswitches to trigger events, leaving the NO pins for the IPAC key fires.

Scumgriever:
Thanks guys,
I'm deep in elecronics reading now.
gonna figure this one out eventually.
Its a good mix of confusing and logical, i like it so far.

I think I have the counter and LED bit figured, not sure how I can get it to stop the credit buttons from registering when there is 0 on the counter.

Do you know of any good resources that I should have a look at?

I cant seem to find many instructional type sites, lots of parts and specific details of parts which helps and is what i'm going off so far but I'm sure i'm just looking in the wrong places.


grantspain:
there was a credit board designed to do what you want basically it works by storing the credits on the credit board and then when each player press their start button it will take a credit away-now most modern credit boards do this via a select dil switch(klingon etc) but the one you need has four outputs and was specific to only a few games,i think it was called a quattro but it was a very long time ago-a company in the u.k called electrocoin had credit boards with 7 segment displays for credits

Thenasty:
how about if the player PRESSES the button even tho his game is not OVER yet ? It will decrease your counter and loss his credit. Something must be done with that also, or else, all inserted credit will be lost if player presses the P1 start several times....

JeepMonkey:
In response to Thenasty...

You could use a latching circuit.  Hitting the Start button would make the output go high, and any other button would make the output go low.  Sure, wiring every button to an OR gate would probably be over kill, so just wire up the two main buttons to that player.  This way you could hit the Start button multiple times without taking credits away.  Maybe use a flip flop?

I realize this would not protect against every scenerio, but it would take care of some OOPs.

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