Hacking FDS 3206 write enable mod for the Famicom Disk System

[SylverReZ]

I've recently worked on my own design for a modchip in particular for the Famicom Disk System. Drive controllers using the FDC-3206/P have tight security measures in place to prevent users from copying and writing to disks because of the ongoing rampant piracy in Asia. That's when this circuit comes into play, this messes with the protection circuit logic and re-enables the write enable functionality to copy disks again. All that is needed to make this are two logic ICs - a 74LS76 and a 74LS45.

The schematics are based off the ones from Famicom World (seen here), my version reworks this schematic into a much more cleaner design.

https://github.com/m4x10187/fdc-3206-write-mod

 

[skawo]

That's neat.

How common are these 3206 drives, anyway?
I currently have, uh, a lot of FDSes, and they're literally all 7201s, somehow.

 

[SylverReZ]

That's neat.

How common are these 3206 drives, anyway?
I currently have, uh, a lot of FDSes, and they're literally all 7201s, somehow.

There's a useful guide out there which can determine whether this is the case. https://www.famicomworld.com/forum/index.php?topic=2934.0

 

[skawo]

Yeah, I know how to determine it. All of mine are the old write-unprotected revision, bar needing minor modifications on the power board.

 

[SylverReZ]

Yeah, I know how to determine it. All of mine are the old write-unprotected revision, bar needing minor modifications on the power board.

If you do come across one that is a 3206, then good luck trying to install one.

 

[skawo]

I think I'm done buying FDSes for my lifetime, but I'll keep this in mind

 

[SylverReZ]

I think I'm done buying FDSes for my lifetime, but I'll keep this in mind

Good stuff. I'm pretty done with collecting too many consoles, but I keep buying them.

 

[skawo]

I mean, I got a lot of 6 FDSes for $22 and like $50 shipping, couldn't pass that up, could I? :v

And then all they needed was some belts. Super fun and satisfying to restore, too

 

[SylverReZ]

I mean, I got a lot of 6 FDSes for $22 and like $50 shipping, couldn't pass that up, could I? :v

And then all they needed was some belts. Super fun and satisfying to restore, too

Woah, shipping sounds high, but is good enough I bet.