Ok- count me as completely lost here.
I have a Williams Grand Prix which is a 1976 game and I am very confused about why its working the way it is when I add a single quarter.
The manual (which is all we should need) is available at the IPDB page
I attached a photo of the relevant page at the end....
IF I have the following set up
1 coin- 1 play/2 coins- 3 play jumper in the OFF position
5 c adjustment in 2 coins (think this is irrelevant)
10 c adjustment in the zero position or basically unplugged
25 c adjustment in the 1 position (with the bottom legs of the plug hanging off the end of the jumper and not engaged- but they are not wired anyhow)
When I drop a quarter through the coin door, with the game in a ZERO credit position on the credit wheel. The following things happen
The credit unit DOES NOT INDEX UP-
The PLAYER unit indexes up by one, its as if you indexed the credit wheel to 1, and hit the start button to use that credit to start a 1 player game.
If I then add another quarter, it simply ADDS a player.
I can keep going until I exceed 4 players and nothing much happens- you do not begin to get credits
IT SEEMS LIKE THIS IS WRONG... but it works so well, its almost like its supposed to do this. WHY is it adding players and starting a game automatically? Why is it NOT adding credits?
So for additional data points- I tested its behavior under a bunch of other settings and to me, it works as expected under every other set up I tried... so here is what works... and maybe this all means the first part is expected behavior but I don't understand it.
Additional TEST condition 1
If I move the 25 c adjustment stack to the 2, 3, 4 etc position and with the credit wheel in the zero position (moving nothing else) I add a single quarter and .......
I get 2,3,4 etc credits per quarter (depending on where the stack is) and the credit wheel moves the correct # increment up and I start a game the normal way with the start button adding players removes additional credits as would be expected. I view this as fully anticipated behavior.
Additional TEST condition 2
If i move the 1 coin/1 play 2 coins/3 play jumper to the ON position, and as the manual says, then position the 25 c and 10 c adjustments into the #6 and #2 positions- when I add a single quarter the credit wheel increments 1, when I add a second quarter it increments 2, and on the third quarter it adds 1 while the fourth again adds 2 credits.
Again, fully normal anticipated programmed behavior.
So- can someone explain what possibly is wrong with my understanding of the first condition and the, ?ODD? behavior I describe (or is it normal, and if its is WHY). Why is it that adding a single quarter with the quarter position switch in the 1 position, results in addition of players to a game without ever indexing the credit wheel and why is the game "auto started" under this condition?????? - WHY DOES IT DO THIS!
SHOULD IT DO THIS?
Pic of page is below.