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 Twin Famicom Modded Control Pad

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Drakon
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PostSubject: Twin Famicom Modded Control Pad   Fri Jun 07, 2013 3:01 pm

I really like how my twin famicom controllers look so I decided to mod them to fix things that bother me.  I performed the following mods:

1: Relocated the cord so it comes out a hole in the top of the case instead of the side

2: Wired the controller into a nes controller port

3: Modded the pcb so it can work with extension cords

After wiring up this pad I quickly discovered that it wouldn't work with extension cords.  I probed my extension cord it's wired right so I took an educated guess that too much distance messes up the control pad signals.  It's safe to assume this considering this controller is meant to be hardwired into a famicom without extension cords.  My dogbone nes controllers which I've used for years work fine with as many extension cords as I like in between the control pad and the system.  I decided to compare the dogbone pcb to the pcb found in all hard wired famicom controllers / original rectangular nes controller.  The big difference I discovered is in the dogbone controller there's two 3.6k ohm resistors connected to vcc and the other ends connect to cup and out 0.  I added 3.6k ohms of resistance on my twin famicom controller pcb between these two spots and sure enough that fixed the controller cord length issue.

Pinout:



Here's what my twin famicom pad looks like:





Here's a quick schematic of the mod:



Last edited by Drakon on Wed Jul 17, 2013 6:09 pm; edited 1 time in total
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PostSubject: Re: Twin Famicom Modded Control Pad   Tue Jun 18, 2013 11:35 am

My 3.6k ohm resistors showed up so I was able to mod both pads with a minimal amount of parts instead of a bunch of daisy chained resistors like what I was using in the prototype version of this mod:





To be safe I tested both pads on a clone first.  After I confirmed they're working as they should on the clone I tested both on my rgb twin famicom using a super long extension cord and both control pads work great.  Internals of this mod are now done.  All that's left to do is wait for the screws to arrive so I can install a clean looking project box around where I soldered the wires together.
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PostSubject: Re: Twin Famicom Modded Control Pad   Wed Jun 19, 2013 10:35 pm

nice project, drakon but. wouldnt it be better to plug dogbones into the twin or do they not work with it? they are soooo much more comfortable.
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PostSubject: Re: Twin Famicom Modded Control Pad   Wed Jun 19, 2013 10:37 pm

i dont have any fond memories of the old square controllers. I was too young, i have used dogbones since 1993 though and when i try the squares my hands just want to and do cramp up.
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PostSubject: Re: Twin Famicom Modded Control Pad   Wed Jun 19, 2013 10:52 pm

The dog bones work fine on this system, I prefer the look of the pads that come with it. The dog bones feel nicer but these look nicer.
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Twin Famicom Modded Control Pad
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