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Wattage in arcade boards
#312190 - 07/29/13 10:18 PM
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Is there a way to find out how many watts an arcade board needs in order to function properly? In my case, again, it's "Street Fighter II".
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Re: Wattage in arcade boards
[Re: DaRayu]
#312193 - 07/29/13 10:29 PM
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With standard Jamma arcade boards the general rule of thumb is get an adjustable arcade power supply and a digital multimeter and set the 5V out to 5.1V. That will run 99% of Jamma boards including every SF2 I've ever tried. Some huge boards need more, like Midway boards from the 90s that supply power into hard drives and a lot of IT boards sucked the power too, and stuff like System 246. Those might need 5.35 or so, but use that info at your own risk.
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Re: Wattage in arcade boards
[Re: Smitdogg]
#312196 - 07/29/13 11:27 PM
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O.k., I don't really know much about that stuff, so I will ask straight away: I bought a supergun that comes with an external generic power supply:
Input: 100-240V~47-63Hz 1.35A
Output: 42W max
Pin3: +5V --- 5A
Pin5: +12V --- 2A
Pin1,2,4: Common
Shell: GND
Is this alright to play "Street Fighter II" or do I need a more powerful one with a higher wattage number in the long run?
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Re: Wattage in arcade boards
[Re: DaRayu]
#312197 - 07/29/13 11:49 PM
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100-240 means there should be a switch for either 115 or 230. In the US we set this to 115. Other countries I have no idea. Most Jamma needs +5, -5 and +12V. If your power supply doesn't have -5 then it's pretty useless but Capcom didn't use it on CPS1 or 2, I don't think, so it should work for those. If it's a supergun someone made I imagine it does have -5 too though. You might want to get a shitty test board. Well it depends on the supergun I guess, who built it. I don't know about watts on arcade power supplies, I've only paid attention to volts. Mine says max 104W out.
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Re: Wattage in arcade boards
[Re: Smitdogg]
#312199 - 07/30/13 01:46 AM
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> 100-240 means there should be a switch for either 115 or 230.
It's a multi-national device. You don't need to use a switch. It uses the correct value automatically, so all you need is a standard PC power supply cable for your country and plug it in.
> Most Jamma needs +5, -5 and +12V. If your
> power supply doesn't have -5 then it's pretty useless but Capcom didn't use it on
> CPS1 or 2, I don't think, so it should work for those.
Yes, it does work. The supergun works perfectly fine. It's just that someone told me that arcade boards need a certain wattage to function properly for a long period of time without damage. That's why I need to know if that's really true and if it's true for old bords from 1991 as well.
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italie |
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MAME owes italie many thank yous, hah
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Re: Wattage in arcade boards
[Re: DaRayu]
#312204 - 07/30/13 03:56 AM
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> O.k., I don't really know much about that stuff, so I will ask straight away: I
> bought a supergun that comes with an external generic power supply:
>
> Input: 100-240V~47-63Hz 1.35A
> Output: 42W max
>
> Pin3: +5V --- 5A
> Pin5: +12V --- 2A
> Pin1,2,4: Common
> Shell: GND
>
> Is this alright to play "Street Fighter II" or do I need a more powerful one with a
> higher wattage number in the long run?
You'll be fin running most boards with that supply, short of games that require a hard drive. even then you might be able to do it.
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| italie |
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MAME owes italie many thank yous, hah
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Re: Wattage in arcade boards
[Re: Smitdogg]
#312205 - 07/30/13 03:58 AM
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> With standard Jamma arcade boards the general rule of thumb is get an adjustable
> arcade power supply and a digital multimeter and set the 5V out to 5.1V. That will
> run 99% of Jamma boards including every SF2 I've ever tried. Some huge boards need
> more, like Midway boards from the 90s that supply power into hard drives and a lot of
> IT boards sucked the power too, and stuff like System 246. Those might need 5.35 or
> so, but use that info at your own risk.
Judging amp draw by the voltage required is a dirty method of adjusting power...icky icky icky....
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Re: Wattage in arcade boards
[Re: italie]
#312208 - 07/30/13 04:18 AM
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It might be helpful if you told us your method for figuring it out, but probably not because it probably requires hardware and study nobody would spend hobby money or time on. The only time I've ever broken a board is during desoldering and I'm convinced that is unavoidable sometimes because of how shitily some pcbs are made.
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| italie |
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MAME owes italie many thank yous, hah
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Re: Wattage in arcade boards
[Re: Smitdogg]
#312213 - 07/30/13 09:26 AM
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> It might be helpful if you told us your method for figuring it out, but probably not
> because it probably requires hardware and study nobody would spend hobby money or
> time on. The only time I've ever broken a board is during desoldering and I'm
> convinced that is unavoidable sometimes because of how shitily some pcbs are made.
Figuring it out would suck, if at all possible. You look it up. If it isn't listed, over supply and fuse where prudent. You can't over-supply current to a board unless it's faulty, but on the flip-side it will become faulty rather quick if you under current.
You want your voltage at ~5.08, giving just enough extra juice to keep the level above 5v on the long ass, ill-regulated power runs that arcade pcbs seem to have. Pushing voltages to 5.35 and up is either compensating for a shitty design, compensating for bad grounding/component issues, or trying to compensate for a brown out condition. All you end up doing is over-voltage the nearest ICs to the supply, shortening their life.
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Re: Wattage in arcade boards
[Re: italie]
#312214 - 07/30/13 09:32 AM
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> It might be helpful if you told us your method for figuring it out
Figuring what out? Breaking a board? No, I didn't break one. It's just that somebody told me that the current power supply might damage the games in the future. That's why I want to know if he's right.
> You'll be fin running most boards with that supply, short of games that require a
> hard drive. even then you might be able to do it.
Here we have a page with arcade manuals. "Street Fighter II" is also on the list.
In the "Street Fighter II" manual, the following is written:
Power requirements:
FCC Approved power supply
+5 VDC | 7 amp
+12 VDC | 1 amp
Why are there two values? Do I have to add them up? In that case, we would have
5 * 7 + 12 * 1 = 35 + 12 = 47W
My power supply is only for 42W. So, does that mean it isn't good enough? Or do I just have to take the higher value from above text, i.e. 5 * 7 = 35W?
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Re: Wattage in arcade boards
[Re: DaRayu]
#312220 - 07/30/13 12:17 PM
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> Yes, it does work. The supergun works perfectly fine. It's just that someone told me
> that arcade boards need a certain wattage to function properly for a long period of
> time without damage. That's why I need to know if that's really true and if it's true
> for old bords from 1991 as well.
Well, of course it's true. But the wattage required depends on the board, and you'd need to read the manual to find out what it is. See if you can get a copy of the manual for your board online.
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Re: Wattage in arcade boards
[Re: Vas Crabb]
#312221 - 07/30/13 12:27 PM
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I wrote the values from the manual in the above post:
Power requirements:
FCC Approved power supply
+5 VDC | 7 amp
+12 VDC | 1 amp
I just don't know what the final value is. Do I have to take the higher value as a reference (5V * 7amp = 35W)? Or do I need to add both values (5V * 7amp + 12V * 1amp = 47W)?
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Re: Wattage in arcade boards
[Re: DaRayu]
#312225 - 07/30/13 01:38 PM
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> I wrote the values from the manual in the above post:
>
> Power requirements:
> FCC Approved power supply
> +5 VDC | 7 amp
> +12 VDC | 1 amp
>
> I just don't know what the final value is. Do I have to take the higher value as a
> reference (5V * 7amp = 35W)? Or do I need to add both values (5V * 7amp + 12V * 1amp
> = 47W)?
So let's look at this logically:
+5V required for board = 7A
+5V available from supply = 5A
+12V required for board = 1A
+12V available from supply = 2A
So your power supply isn't adequate on the +5V rail. You'll want something that supplies at least 10A at +5V unless you want to risk burning out the power supply, the board, or both.
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Re: Wattage in arcade boards
[Re: italie]
#312228 - 07/30/13 02:46 PM
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Well it would have to be "bad design" I guess because I've had so many of them, 90s IT boards, Midways with hard drive and full 246 systems, all acting the same way, every one of them needed more than 5.1 out. I'm pretty sure all the people using PC power supplies hacked up into superguns are constantly going well over 5.1 too on the +5.
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Re: Wattage in arcade boards
[Re: Vas Crabb]
#312251 - 07/30/13 10:04 PM
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> So your power supply isn't adequate on the +5V rail. You'll want something that
> supplies at least 10A at +5V unless you want to risk burning out the power supply,
> the board, or both.
Alright, thanks for the information.
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| italie |
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MAME owes italie many thank yous, hah
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Reged: 09/20/03
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Posts: 15246
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Re: Wattage in arcade boards
[Re: Smitdogg]
#312263 - 07/31/13 04:16 AM
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> Well it would have to be "bad design" I guess because I've had so many of them, 90s
> IT boards, Midways with hard drive and full 246 systems, all acting the same way,
> every one of them needed more than 5.1 out. I'm pretty sure all the people using PC
> power supplies hacked up into superguns are constantly going well over 5.1 too on the
> +5.
I won't disagree. Just saying that it's bad.
I blame Lev.
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