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 Post subject: AX5202P
PostPosted: Tue Jan 19, 2016 3:52 pm 
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Location: Detroit, MI
Anyone have any information on this chip, other than the fact that some bootlegs utilize it. Is this for MMC3 games? The chip was mentioned here, but the page seems down:

viewtopic.php?p=75678#p75678

Is there a dump of this chip or are there any replacement parts, pin-compatible or otherwise?


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 Post subject: Re: AX5202P
PostPosted: Tue Jan 19, 2016 4:33 pm 
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Location: Seattle
Behold the magic of the web archive: http://web.archive.org/web/201409202322 ... /pmmc3.htm

(Any time something's gone, try prepending the URL with " http ://web.archive.org/web/*/ " It doesn't always work, but when it does it's handy)

Yes, it's an MMC3 clone. The pin order is almost the same as the authentic MMC3, with a few ground and nc pins missing, and it's offset (AX5202P pin 1 ↔ MMC3 pin 29; AX5202P pin 2 ↔ MMC3 pin 30)


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 Post subject: Re: AX5202P
PostPosted: Wed Jan 20, 2016 9:17 am 
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lidnariq wrote:
Behold the magic of the web archive: http://web.archive.org/web/201409202322 ... /pmmc3.htm

(Any time something's gone, try prepending the URL with " http ://web.archive.org/web/*/ " It doesn't always work, but when it does it's handy)

Yes, it's an MMC3 clone. The pin order is almost the same as the authentic MMC3, with a few ground and nc pins missing, and it's offset (AX5202P pin 1 ↔ MMC3 pin 29; AX5202P pin 2 ↔ MMC3 pin 30)


Thanks. I had run the site through wayback machine and got no hits. I must have done it wrong.
So this Chip is not programmable, as in it a massively produced clone chip?


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 Post subject: Re: AX5202P
PostPosted: Wed Jan 20, 2016 9:49 am 
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It's not programmable. It's a mass-produced clone chip.

If you're looking for replacement parts, any MMC3 ought to work (unless the game requires a specific MMC3 variant).


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 Post subject: Re: AX5202P
PostPosted: Wed Jan 20, 2016 9:53 am 
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Or unless the MMC3 clones you're buying are defective from the factory. I remember reading somewhere that this has historically been a problem with the AX5202P, especially with the programmable interval timer half of the chip. Is it still?


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 Post subject: Re: AX5202P
PostPosted: Wed Jan 20, 2016 11:36 am 
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Location: Detroit, MI
I was looking to make my own boards and MMC3 has eluded me thus far, being as complex as it is in comparison to simpler mappers.
I have a few CPLD's that I have been meaning to learn how to use. May as well start somewhere.


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 Post subject: Re: AX5202P
PostPosted: Thu Jan 21, 2016 4:25 pm 
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Jazzmarazz wrote:
I was looking to make my own boards and MMC3 has eluded me thus far, being as complex as it is in comparison to simpler mappers.
I have a few CPLD's that I have been meaning to learn how to use. May as well start somewhere.


Start with the discrete mappers first if you're working with a CPLD. MMC3 is too complex to just "jump into".


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 Post subject: Re: AX5202P
PostPosted: Thu Jan 21, 2016 6:22 pm 
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Location: Detroit, MI
getafixx wrote:
Jazzmarazz wrote:
I was looking to make my own boards and MMC3 has eluded me thus far, being as complex as it is in comparison to simpler mappers.
I have a few CPLD's that I have been meaning to learn how to use. May as well start somewhere.


Start with the discrete mappers first if you're working with a CPLD. MMC3 is too complex to just "jump into".


Thanks, I think you're right.


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