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PostPosted: Sun May 13, 2018 2:10 pm 
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It means that the Kazzo's AVR's pins are just directly controlled by the native instructions for doing so, and the pin M2 is modified in software whenever it wants to read or write from memory below $8000. (Probably also for above $8000, too, since e.g. N108 seems to rely on M2 as its clock instead of /ROMSEL)

The distinction I'm making is that M2 isn't continuously running, as it does in the actual NES/Famicom; reads and writes are effectively asynchronous in the Kazzo but synchronous in the NES.


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PostPosted: Sun May 13, 2018 9:00 pm 
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That means that multicarts with M2-based reset detection cannot be dumped fully, then, at least unless somebody modifys the Kazzo firmware to allow "reading synchronously".


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PostPosted: Sun May 13, 2018 9:08 pm 
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Correct. This has come up in several threads here (e.g.); people have disabled the reset detector in order to get a dump.


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PostPosted: Sun May 13, 2018 10:04 pm 
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I suppose the CopyNES drives the M2 signal normally, given that it's a modified NES, and thus can be used for dumping such multicarts?


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PostPosted: Sun May 13, 2018 11:13 pm 
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Yeah, the CopyNES doesn't modify M2. I believe all the internal operations cycles on the copyNES look like access to $4800-$4FFF. This is fine with most carts, although is a problem for the N163.

When BootGod asked, I suggested that he change the corresponding control line to A10 instead of A11, moving the copyNES's active range to $4400-$47FF and $4C00-$4FFF. (Rewiring and re-building the firmware was necessary). No mappers that we yet knew of wholly collide with that functional range, so...


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PostPosted: Wed May 16, 2018 3:45 pm 
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Just reporting that the multicart in question has been successfully dumped on the first try using a CopyNES.


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