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Coin adjustment in Bally MPU-35 (Flash Gordon)


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#1 DreyMIX

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Posted 03 December 2025 - 01:01 AM

Hi, I wanted to know if I can get just one credit by pressing the 5 button. Currently, on the Flash Gordon table, if I press the 5 button, it gives me 2 credits. How can I change it so that when I press it, it only gives me 1 credit? Thanks.



#2 Tesla

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Posted 03 December 2025 - 01:33 AM

I don't really know, but I do have and like this VPX table.

 

I do know there are "multiple Coin buttons" provided by VPX/vPinMame to the Tables in general. Maybe one of those others will be more to your liking?

 

Additionally, I do suggest your take a look at the F6 Dip-Switches. To make it a bit easier, you basically just "turn them all on".

 

I also suggest you check-out XenonPH's sound-mod version (if you haven't already).

 

As an aside, I used to play this pinball-machine as a teenager when it was new in the arcades. 1 token= 1 play and I kinda-doubt they turned-on all the dip-switches for us <smile>

Edited by Tesla, 03 December 2025 - 01:48 AM.


#3 DreyMIX

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Posted 03 December 2025 - 03:36 PM

Hi, thanks. I also downloaded the official table manual, and it says that DIP switches 17, 18, 19, and 20 should be OFF. It also says to keep DIP switches 1, 2, 3, 4, and 5 OFF.

 

I'm currently using the VPW version released a few days ago, and I'm really happy with it.

I don't want to change tables.

 

I also opened the script and noticed that there are some values ​​that override the default Bally DIP switches (Bally.vbs), and then pressing F6 brings up options that have absolutely nothing to do with setting credit.

If I try to delete those lines from the script and restart the table, after pressing F6, the default DIP switches, 1 through 32, appear. I only have DIP switches 21 (Game over attract adjustment) and 27 (Credit display) active; the rest are all disabled. This also applies to pressing F3 or closing the table and reopening it. Still pressing the 5 button I get 2 credits instead of 1. Something doesn't add up.



#4 GHOSTfaceKILLr7

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Posted 03 December 2025 - 03:55 PM

Hi, thanks. I also downloaded the official table manual, and it says that DIP switches 17, 18, 19, and 20 should be OFF. It also says to keep DIP switches 1, 2, 3, 4, and 5 OFF.

 

I'm currently using the VPW version released a few days ago, and I'm really happy with it.

I don't want to change tables.

 

I also opened the script and noticed that there are some values ​​that override the default Bally DIP switches (Bally.vbs), and then pressing F6 brings up options that have absolutely nothing to do with setting credit.

If I try to delete those lines from the script and restart the table, after pressing F6, the default DIP switches, 1 through 32, appear. I only have DIP switches 21 (Game over attract adjustment) and 27 (Credit display) active; the rest are all disabled. This also applies to pressing F3 or closing the table and reopening it. Still pressing the 5 button I get 2 credits instead of 1. Something doesn't add up.

The previous table by rothbauerw and bord doesn't have this problem so it's clearly a script issue with the new VPW table.

Also I noticed when you load up the game, adding one credit will give you 2 games but after playing a game adding 1 credit will now give you one game. Very strange?!



#5 DreyMIX

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Posted 03 December 2025 - 04:26 PM

 

Hi, thanks. I also downloaded the official table manual, and it says that DIP switches 17, 18, 19, and 20 should be OFF. It also says to keep DIP switches 1, 2, 3, 4, and 5 OFF.

 

I'm currently using the VPW version released a few days ago, and I'm really happy with it.

I don't want to change tables.

 

I also opened the script and noticed that there are some values ​​that override the default Bally DIP switches (Bally.vbs), and then pressing F6 brings up options that have absolutely nothing to do with setting credit.

If I try to delete those lines from the script and restart the table, after pressing F6, the default DIP switches, 1 through 32, appear. I only have DIP switches 21 (Game over attract adjustment) and 27 (Credit display) active; the rest are all disabled. This also applies to pressing F3 or closing the table and reopening it. Still pressing the 5 button I get 2 credits instead of 1. Something doesn't add up.

The previous table by rothbauerw and bord doesn't have this problem so it's clearly a script issue with the new VPW table.

Also I noticed when you load up the game, adding one credit will give you 2 games but after playing a game adding 1 credit will now give you one game. Very strange?!

 

It seems to me that even after the first game, if I put in credits, it always adds 2.

At this point, it might be a scripting issue.

 

But did the previous table (which I haven't tried) use the same ROM (flashgdn.zip)?



#6 Tesla

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Posted 03 December 2025 - 04:40 PM

Hi, thanks. I also downloaded the official table manual, and it says that DIP switches 17, 18, 19, and 20 should be OFF. It also says to keep DIP switches 1, 2, 3, 4, and 5 OFF.

 

 

 

No, I don't think so.

 

https://www.vpforums...=38906&p=548338

 

But like your Coin selection issue, you are free to set the Dip-Switches however you like. 

 

EDIT: Of course, I'm only taking out the Dip-Switches presented in F6 ... I thought we were talking about a VPX-Table?


Edited by Tesla, 03 December 2025 - 10:59 PM.


#7 GHOSTfaceKILLr7

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Posted 03 December 2025 - 09:31 PM

 

 

Hi, thanks. I also downloaded the official table manual, and it says that DIP switches 17, 18, 19, and 20 should be OFF. It also says to keep DIP switches 1, 2, 3, 4, and 5 OFF.

 

I'm currently using the VPW version released a few days ago, and I'm really happy with it.

I don't want to change tables.

 

I also opened the script and noticed that there are some values ​​that override the default Bally DIP switches (Bally.vbs), and then pressing F6 brings up options that have absolutely nothing to do with setting credit.

If I try to delete those lines from the script and restart the table, after pressing F6, the default DIP switches, 1 through 32, appear. I only have DIP switches 21 (Game over attract adjustment) and 27 (Credit display) active; the rest are all disabled. This also applies to pressing F3 or closing the table and reopening it. Still pressing the 5 button I get 2 credits instead of 1. Something doesn't add up.

The previous table by rothbauerw and bord doesn't have this problem so it's clearly a script issue with the new VPW table.

Also I noticed when you load up the game, adding one credit will give you 2 games but after playing a game adding 1 credit will now give you one game. Very strange?!

 

It seems to me that even after the first game, if I put in credits, it always adds 2.

At this point, it might be a scripting issue.

 

But did the previous table (which I haven't tried) use the same ROM (flashgdn.zip)?

 

Yes. The previous version uses the same rom "flashgdn".



#8 DreyMIX

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Posted 03 December 2025 - 09:53 PM

 

Hi, thanks. I also downloaded the official table manual, and it says that DIP switches 17, 18, 19, and 20 should be OFF. It also says to keep DIP switches 1, 2, 3, 4, and 5 OFF.

 
No, I don't think so.
 
https://www.vpforums...=38906&p=548338
 
But like your Coin selection issue, you are free to set the Dip-Switches however you like.

 


I downloaded that manual and looked at the credit settings. I also ran several tests after removing the custom DIP settings from the script. So with those DIPs set as per the manual, it still doesn't work.

 

Screenshot-2025-12-03-224442.png

 

I also tried the setting below (1/1 coin) with S17 ON, S18 OFF, S19 OFF and S20 OFF, but same thing.

 

 



#9 Mrtr32

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Posted 03 December 2025 - 09:56 PM

For the new Flash Gordon (Bally 1981) VPW Mod table:

 

The reason why the credit key 5 add 2 credits is simple.

The vbs table script send 1 credit at the same time as the Bally.vbs script

this way, two instances of credit are sent at the same time giving two credits for one shot  :)

 

you just have to add a remark or remove the line 839 in the table script

 

Original

839         vpmTimer.pulseSw 10

 

Fix for 1 credit

839       ' vpmTimer.pulseSw 10  (or remove this line)


Edited by Mrtr32, 04 December 2025 - 12:27 AM.


#10 DreyMIX

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Posted 04 December 2025 - 01:07 PM

For the new Flash Gordon (Bally 1981) VPW Mod table:
 
The reason why the credit key 5 add 2 credits is simple.
The vbs table script send 1 credit at the same time as the Bally.vbs script
this way, two instances of credit are sent at the same time giving two credits for one shot  :)
 
you just have to add a remark or remove the line 839 in the table script
 
Original
839         vpmTimer.pulseSw 10
 
Fix for 1 credit
839       ' vpmTimer.pulseSw 10  (or remove this line)

Thanks!!!
I'll try it as soon as I get home and let you know.

#11 DreyMIX

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Posted 04 December 2025 - 07:26 PM

@Mrtr32 Workkkk!!! 

 

Thank you so much!

 

Just out of curiosity. Why was that line inserted?

What exactly does it do, inserting the credit? However, I noticed that that condition applies to keyInsertCoin1, keyInsertCoin2, keyInsertCoin3, and keyInsertCoin4.

 

Why is it that when I press key 6 (which should correspond to keyInsertCoin3), it only inserts one credit without any problems?



#12 Mrtr32

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Posted 04 December 2025 - 08:16 PM

I don't know, I'm not the creator of the table.

 

This line send a pulse to inform the controller for each credit added so it's not needed in the table script because the Bally.vbs script do that.


Edited by Mrtr32, 04 December 2025 - 08:16 PM.


#13 Tesla

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Posted 04 December 2025 - 09:46 PM

 

 

Just out of curiosity. Why was that line inserted?

 

 

My guess is that one coin is better than none (so you can play it) ... they are, after all ... imaginary coins.



#14 GHOSTfaceKILLr7

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Posted 04 December 2025 - 10:03 PM

@Mrtr32 Workkkk!!! 

 

Thank you so much!

 

Just out of curiosity. Why was that line inserted?

What exactly does it do, inserting the credit? However, I noticed that that condition applies to keyInsertCoin1, keyInsertCoin2, keyInsertCoin3, and keyInsertCoin4.

 

Why is it that when I press key 6 (which should correspond to keyInsertCoin3), it only inserts one credit without any problems?

I think that script is a delay. Normally you would hit a key on your keyboard and instantly get a credit.

I believe VPW is trying to simulate a coin door where you hear that sound as if you're putting in a coin and a second later the game would register a credit.


Edited by GHOSTfaceKILLr7, 04 December 2025 - 10:06 PM.


#15 DreyMIX

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Posted 05 December 2025 - 01:03 AM

Thanks for all the clarifications!