Quoted from Whysnow:I have no idea why this works as it does not seem to follow the logic of what the settings say they are doing, but it WORKS!
Here's a short explanation that I hope is understandable.
Setting 6 here is set to '8 pulses per credit'.
Setting 02, 03, and 04 are set to '3 pulses per coin'.
Therefore each coin is 3/8ths of a credit.
Coins Credits
1.....3/8
2.....6/8 = 3/4
3.....9/8 = 1-1/8
4.....12/8 = 1-1/2
5.....15/8 = 1-7/8
6.....18/8 = 2-1/4
7.....21/8 = 2-5/8
8.....24/8 = 3
All the fractions just get ignored by the display (or rounded off on later B/Ws and Sterns), so what the player sees is the first credit awarded at 3 coins, the 2nd at 6, and the 3rd at 8. The same sort of trick will work on any other similar pricing scheme, by the way: you just have to do some algebra to find the values of pulses/coin and pulses/credit to make it work. This is in the manual, by the way, it's just really poorly explained.