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Credit Management system for Mame Arcade

This project received 9 bids from talented freelancers with an average bid price of $657 USD.

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Employer working
Project Budget
$250 - $750 USD
Total Bids
9
Project Description

I am looking for a circuit design for a standalone credit management system in a Mame arcade. Circuit will receive a swich input and keep count (up to 99) of the ammount in a pool. Then when another switch is pushed it will remove one unit from the credit pool and active a switch to credit the Mame system. The display is driven by Nixie tubes (NH-12A to be specific) and will be driven by K1551D1 (74141)'s so I need output to work with those components.

Links to help you understand some of the terms and equiptment here.

Mame [url removed, login to view]
Nixie Tube (Nh-12A) [url removed, login to view]
K1551D1 (74141) [url removed, login to view]

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