Twin Famicom Modded Control Pad

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:

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.

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.

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.

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.