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BBB94
Joined: 02 Aug 2005 Posts: 407 Location: WI, USA
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Posted: Tue Mar 21, 2006 9:36 pm Post subject: Onchip battery (or something) |
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I thought I remembered a topic from the old forum about how the Capcom boards have a chip that has an integrated lithium battery or something and that once activated the chip has a limited lifespan.
Assuming I'm not not crazy and/or totally mis-remembering things (both very real possibilities), could the knowledgable folks out there cover the topic again?
P.S. I am moving foward on the merchandise in the background and will have more info in the coming weeks, when I have more time and answers. |
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Bertl
Joined: 02 Aug 2005 Posts: 187 Location: Vienna/Austria
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Posted: Wed Mar 22, 2006 8:53 am Post subject: |
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Marvin says:
QUOTE:
CPU Battery.
I hear alot of stuff about those batteries. Sometimes I read, "those batteries will last forever", and sometimes I read that the replacements are readily available (original and aftermarket). Fact is I never saw a CPU board needing one up until recently.
Now we all know batteries do not live forever. and we all know the damage leaking batteries can cause. So how did Capcom handle this? They use a "zeropower" RAM chip on the CPU board (instead of a remote mounted AA battery pack).
Essentially this is a 28 pin 6264 CMOS RAM chip with a battery mounted to the TOP of the chip. THE BATTERY IS NOT REPLACABLE! So when it dies, you just buy a new "zeropower" ram chip (which by the way, is NOT socketed!)
Zeropower RAMs will not be available forever. Really they are already obsolete (at least this style), and they have limited shelf life (that is, it's probably not a good to stock up on these RAMs and keep them forever). Since the battery is mounted right to the chip, it would be best to buy a fresh one when it's time for replacement.
The zeropower RAM's are still made by a couple companies and are available. They are widely used in the embedded controller market. There are two primary manufacturers: US company: Maxim (www.maxim-ic.com), French company: SGS Thomson (www.st.com)
The Maxim part is prefered by many (originator's of this battery built in part), but the ST part is easier to find. Both work equally well. For examples see the Mouser catalog.
Also Maxim makes these with a 'keep fresh' circuit (not sure about ST). As delivered from the factory, the battery is internally disconnected from the memory. As soon as you apply power to them for the first time, the battery is enabled permanently. This in theory gives them an unlimited shelf life if the part is never powered up. But it's still always best to install a "fresh one" instead of stocking up on these.
Another potential solution is to figure out a way to wire a remote AA battery holder, like so many of the other pinball companies use.
UNQUOTE
So i think, if this problem will, if ever, come into reality, it can be fixed.
I never had a problem with the battery with my Capcoms. But i also do not know anybody who had changed the battery one of the above mentioned ways.
Brgds
Norbert |
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BBB94
Joined: 02 Aug 2005 Posts: 407 Location: WI, USA
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BigBangJoe
Joined: 02 Aug 2005 Posts: 134 Location: Gent, Belgium
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Posted: Sat Mar 25, 2006 12:34 pm Post subject: |
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That's way too complex for my feeble brain, but if someone ever finds a suitable (and modern) replacement part, then I certainly want to know about it |
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BBB94
Joined: 02 Aug 2005 Posts: 407 Location: WI, USA
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Posted: Sun Apr 02, 2006 5:20 pm Post subject: |
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The Capcom part in question (at least on the BBBs) is the ST M48Z08-100PC1. This is a non-timekeeping chip that has a 4.75V to 5.5V Vcc (which is permissible supply voltage). I see no reason why a 70ns part with a minimum Vcc of 4.5V wouldn’t work (but am no micro-electronics genius). If I am correct, then it seems that the M48Z58Y-70MH1 chip and M4Z28-BR00SH1 Snaphat would be suitable replacements if the originals start to go bad.
Perhaps I will try to find a M48Z08-100PC1 to dissect to determine if the battery is truly un-replaceable and/or if there is another way to power the chip. It might be nice to have the option of cutting or drilling a couple holes in the existing chip to attach a new battery, than to have to de-solder and re-solder a new chip onto the circuit board. |
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kirklake13
Joined: 21 Jun 2007 Posts: 53 Location: NW New Jersey
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Posted: Sun Jun 14, 2009 11:42 am Post subject: still losing HS |
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So has anyone actually replaced this chip with the battery? If so did it fix the loss of HS problem? I have obtained an NOS CPU from Kerry, is the chip in question on the CPU? Will replacing the whole board also fix the issue of losing HS? or tis that questionable too?
captkirk
BBB#78 _________________ BBB #102 |
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BBB94
Joined: 02 Aug 2005 Posts: 407 Location: WI, USA
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Posted: Tue Dec 24, 2013 2:06 pm Post subject: |
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I'm surprised we haven't heard of these batteries starting to fail. I thought they had an expected life of 10 years. The boards were likely close to 10 years old in 2006. Now they are over 15 years old.
I never did get around to experimenting on the chip repairs or replacement.
Some information can be found here:
http://www.pinrepair.com/capcom/ |
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