Medieval Madness (Remake - Standard)
Chicago Gaming Co., 2015Built an extension connector for my diagnostic switch assembly so I could run it through the coin door (bill acceptor hole) and not have to use the key.
DOESN'T WORK. Pin firmware disallows it.
Why is that? Do all manufacturers impose this restriction? Seems silly, must have the door open? This disables the coils which is a large part of what you can test with the switches.
This is Chicago Gaming MMR.
Thanks
Quoted from mcbPalisade:Built an extension connector for my diagnostic switch assembly so I could run it through the coin door (bill acceptor hole) and not have to use the key.
DOESN'T WORK. Pin firmware disallows it.
Why is that? Do all manufacturers impose this restriction? Seems silly, must have the door open? This disables the coils which is a large part of what you can test with the switches.
This is Chicago Gaming MMR.
Thanks
All wpc do this so that if one of the door switches is glitching the adjustments won't get messed up. I think the 'door closed' switch is separate from the high voltage switch though, so you could just bypass that switch
Quoted from zacaj:All wpc do this so that if one of the door switches is glitching the adjustments won't get messed up. I think the 'door closed' switch is separate from the high voltage switch though, so you could just bypass that switch
There are indeed two switches on the door. One does all the HV work, one informs the controller. So the system is intrinsically safe in that if you open the door the HV switch turns off the HV, the other switch just informs the user and gets in their way ( - :
Also of note if you lift the playfield and the door is closed you can electrocute your self nicely ) - :
So maybe bring the information switch out with the other 4 and flip it to fool the controller into thinking the door is open.
Figured it was time to search for information about Williams WPC. I find a lot of stuff about WPC-95. First, what does WPC stand for?
The schematic I found shows all the wiring for a whole pinball machine, including a "Babcock Display". Did this apply to an entire generation of machines?
Did this generation of machines always have the "2 switch" interlock? Attached is a picture of the part of the circuit that did the real work:
Quoted from mcbPalisade:Figured it was time to search for information about Williams WPC. I find a lot of stuff about WPC-95. First, what does WPC stand for?
The schematic I found shows all the wiring for a whole pinball machine, including a "Babcock Display". Did this apply to an entire generation of machines?
Did this generation of machines always have the "2 switch" interlock? Attached is a picture of the part of the circuit that did the real work:
There are three main versions. WPC 89, WPC-S, and WPC 95.
You should be able to find pdfs for each online. The schematics for the boards and generic wiring (like the power) are distributed separately from the games.
Early games didn't have high voltage interlocks, just a door closed sensor, they were added in 93-94 somewhere I think. Not sure if the later games still had two switches, they could theoretically have just had a high voltage but I've never owned one
Quoted from wdennie:I thought the second switch was to protect the mpu, so with the door closed someone couldn't change the settings.
With the door closed you can't push the switches because you can't get there.
How does the second switch protect the MPU?
Quoted from mcbPalisade:With the door closed you can't push the switches because you can't get there.
Quoted from wdennie:I thought the second switch was to protect the mpu, so with the door closed someone couldn't change the settings.
Was for anti-theft.
Don't want people giving themselves credits, or messing up the game somehow.
And yes - never, *ever* underestimate the general public trying to get free stuff out of games and vending machines like this. Oy. I've seen a lot of crap done - and depending on the location of the switches.. a bright kid with too much free time on his hand could activate them.
Oh I get it, closed for honest people. If there were something like a previous hole for a lock bar some kid (like us when we were younger : - ) would bend a wire hanger so he could push the service credit button and play for free.
Now THAT makes sense.
Quoted from mcbPalisade:With the door closed you can't push the switches because you can't get there.
How does the second switch protect the MPU?
second switch is the HV cut off
Quoted from wdennie:second switch is the HV cut off
But this doesn't protect the MPU, just the service technician. The logic is still operating as the "HV Shut Off" display says.
The second switch isn't mean to to protect the MPU - it's for unsuspecting techs so they don't get shocked.
The first switch - the one that won't let you use the service switches - is the switch he was talking about when he said it 'protects' the MPU. In OLDER systems, that's its main purpose (AFAIK), and the term just stuck with it.
Quoted from zacaj:Did it ever do anything besides disable the switches? I always thought that's what memory (the adjustments) it was protecting
In WPC, no. It just disables the switches.(*)
In earlier machines, no clue; I'm not familiar enough with earlier machines. 
(*) - Technically, in most WPC machines that have the high power interlock as well, it tells the game's OS to also pop up the warning that high-voltage is disabled. 
Can someone post the portion of the WPC-95 schematic that shows the "coin door open" circuit? Browsing through it I could not locate that part. Thanks.
Or any Williams version would do.
http://arcarc.xmission.com/Pinball/PDF%20Pinball%20Misc/Williams%20WPC-95%20Schematics%20Manual.pdf bottom left of page 4? Or do you mean just a coin door closed switch? I don't think you're going to find it specifically on the schematics, it's just a normal switch
The design would be the same for any switch matrix switch. Only thing to note is the coin door switches pass through the interface board.
Although, that typical schematic you posted doesn't seem quote right, there's no diode on it.
Quoted from zacaj:Although, that typical schematic you posted doesn't seem quote right, there's no diode on it.
That's an MMR schematic. I would assume that the MMR hardware is different than WPC hardware, and there's a virtualization layer between the
switches and what the game's software reads in the 'matrix'.
I can't help with wiring, since it's likely different than standard MMs and other WPC-95 equipment.
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