EverDrive Forum

General => EverDrive N8 => Topic started by: Barawer on May 14, 2016, 11:33 AM

Title: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on May 14, 2016, 11:33 AM
Now updated with compatibility fix, thanks to GadgetUK! check out his YouTube channel!

I recently bought myself a Famicom AV to be RGB modded later on. I had the N8 NES edition, and didn't want to buy another Everdrive or trade it for a Famicom edition, so i bought a converter.
As you know, the converters don't support expansion audio or MMC5 games, but mods are available in order to restore functionality.
After following a guide, i saw that it didn't really work, so i looked for another guide.. in the end i found 4 guides saying different stuff. only one really worked, so i decided to show you guys exactly what to do. here we go:

What you need:
Soldering Iron and basic soldering skill
Solder
Wire, i recommend Kynar wire
2 10k ohm resistors (you can try out different ones, but the 10K are usually the one recommended)
Copper Tape
Phillips head screwdriver
A small file

I bought a shielded converter, and i would recommend it too.
(https://i.imgur.com/MT2g2NF.jpg)
This is the front. we will work on the back side of the converter.
Turn it around, there might be a sticker. behind the sticker there are two Philips head screws, just unscrew them.

Sadly i wasn't smart enough to take a picture before hand, so i will show you the finished mod. (as you can see i have a lot of soldering spots there, that's the main reason i wanted to make this guide)
(https://i.imgur.com/2oSbRKn.jpg)

NOTE: The pins are counted backwards on the NES side (Left to Right) and on the Famicom side (Right to left)!

For expansion audio:
Between pin 46 and 45 on the Famicom side, cut the connection by scraping it off (or any other method you know of)
Solder a resistor between pin 46 on the Famicom side and pin 54 on the NES side.
Solder a second resistor between pin 45 on the Famicom side, and the previous resistor leg near the Famicom side.
That's it!

For MMC5 game support:
Take two wires and cut them to size.
Cut the connection between pin 48 and pin 49 on the Famicom side buy scarping it off (or any other method you know of)
Solder one end of the wire to pin 48 on the Famicom side, and the other end to pin 57 on the NES side.
Solder one end of the other wire to pin 49 on the Famicom side, and the other to pin 58 on the NES side.
That's it!

Compatibility Fix
There were some reports of incompatibility with some of the games. A Krikzz forum user named GadgetUK has researched it and came up with a great solution. Even if you done seem to have any problems i would recommend doing this.

Now we need the front side of the converter (The side we didn't work on)

Take your copper tape and cut it to size, so it fills the entire PCB on the front but without touching any of the pins.
Tape it on and check for continuity with any of the pins. if there is, try to see where they have a connection and cut it.
Try to remove any bumps or air bubbles by going over it with something straight. If you cant make it 100% its ok, but i had to redo mine since it wasnt covering everything as it suppose. Try to do it as best as you can.
Next, we need to solder the tape to pin 1 on the NES side.
This is my final result (after i re-taped it, and so far so good):
(https://i.imgur.com/TUxoVy6.jpg)

If You Bought the Shielded Converter
You will need to file some of the plastic in order to close it back up.
If you taped the copper tape just make holes in the tape using the screws.
It might be not so pretty, but i don't see any other way.
This is how i did mine:
(https://i.imgur.com/dQTidur.jpg)
Make sure you measure the height and width of it, so you wont file too much or too little.

When you are done, close everything, connect a game with MMC5, or the Everdrive with a game that has expansion audio support, and see if everything worked. If not, you should check that everything is connected and that the connection between the pins on the Famicom side is disconnected.

Hope it helped some of you, and thanks again to GadgetUK for the fix!


Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Great Hierophant on May 15, 2016, 01:15 AM
10K resistors are the recommended resistance, but I always thought that the internal audio was too low compared to the external, at least on a PowerPak. 
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: FeverDrive on May 16, 2016, 01:00 AM
Thanks Barawer for the guide

10K resistors are the recommended resistance, but I always thought that the internal audio was too low compared to the external, at least on a PowerPak.

What resistor value do you recommend?
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on May 16, 2016, 08:39 AM
I think its a matter of testing it and seeing what you like. I didn't do much testing but 10K sound pretty good to me.
Maybe I will get a potentiometer and test some values out.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: fluxcore on May 28, 2016, 12:08 AM
For the MMC5 support, do NES-side pins 57 and 58 need to be separated? They are joined, and I'm wondering what the purpose of two wires is?
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Great Hierophant on May 28, 2016, 03:07 AM
For the MMC5 support, do NES-side pins 57 and 58 need to be separated? They are joined, and I'm wondering what the purpose of two wires is?

Yes, keep them separated on both the Famicom and the NES ends of the adapter.  They are used to control background graphics mirroring.  95% of NES and Famicom carts use standard mirroring methods and leave the two pins connected.  MMC5 can do advanced mirroring and requires the pins to be separated. 
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 14, 2016, 12:37 AM
Just wanted to say thanks for posting this guide!  I did this today, but also added a 68pF cap to the M2 pin, which solved instabilities with my Famicom.  I was having hanging / lockups with games, and resets etc when using an N8.

https://www.youtube.com/watch?v=buLuvjwwI3s
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: immrbig on August 17, 2016, 09:36 AM
Just wanted to say thanks for posting this guide!  I did this today, but also added a 68pF cap to the M2 pin, which solved instabilities with my Famicom.  I was having hanging / lockups with games, and resets etc when using an N8.

https://www.youtube.com/watch?v=buLuvjwwI3s

I saw on your YouTube video comments that you are now trying a 100 ohm resistor in series with M2. How did you make this connection? The via for this line is in an awkward spot--very far away from the NES connector and almost too close to the FC connector.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 17, 2016, 01:23 PM
I did two things - Firstly I lifted the M2 line on the 72 pin connector - so the pin from the 72 pin socket is not connected to the PCB, but I also made a very small cut in the trace (right next to the via on the 60 pin side), then used a wire from the M2 pin on the 72 pin connector, through a 100 ohm resistor and the other end goes to the M2 pin on the 60 pin side.   If you don't cut the trace leading to the 60 pin M2, then the trace runs in parallel with the wire and its the trace that's part of the problem.   So in summary you end up with a wire for the M2 line, running through a 100ohm resistor, and the original PCB trace should not be connected at all.  I've not been able to create any glitches or crashes / lockups since doing this.  Only time will tell whether its a perfect fix but it does seem to be working for me with my 72 pin N8 on the Famicom here.   There are so many variables and really it needs someone more experienced to take a look I think, but it does seem to have solved my problems with my Famicom.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on August 17, 2016, 01:25 PM
Just wanted to say thanks for posting this guide!  I did this today, but also added a 68pF cap to the M2 pin, which solved instabilities with my Famicom.  I was having hanging / lockups with games, and resets etc when using an N8.

https://www.youtube.com/watch?v=buLuvjwwI3s
Glad to help! I wonder what makes this happen, on my Fami AV it works like a charm. I cant watch your whole video right now, but i will. maybe i'll update the guide :) you did a much better soldering job than me :P
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 17, 2016, 03:46 PM
That's really strange!  I have read about people having the same issue I had when using a 72 pin N8 with one of these adapters!  Very odd, but it is working now.  If I remove my M2 wire with the 100 ohm resistor the glitches come back.  Could be a problem related to my Famicom revisions or something - or maybe a glichy CPU or PPU perhaps.  This system has been re-capped as well.  In any case, your mods work fine =D
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: AMike on August 18, 2016, 07:35 PM
Just wanted to say thanks for posting this guide!  I did this today, but also added a 68pF cap to the M2 pin, which solved instabilities with my Famicom.  I was having hanging / lockups with games, and resets etc when using an N8.

https://www.youtube.com/watch?v=buLuvjwwI3s

Thanks for this guide - I've fixed my adapter today. Which games are the best to check? If I had understand correctly Castlevania III is one of the games.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: immrbig on August 20, 2016, 01:11 PM
I did two things - Firstly I lifted the M2 line on the 72 pin connector - so the pin from the 72 pin socket is not connected to the PCB, but I also made a very small cut in the trace (right next to the via on the 60 pin side), then used a wire from the M2 pin on the 72 pin connector, through a 100 ohm resistor and the other end goes to the M2 pin on the 60 pin side.   If you don't cut the trace leading to the 60 pin M2, then the trace runs in parallel with the wire and its the trace that's part of the problem.   So in summary you end up with a wire for the M2 line, running through a 100ohm resistor, and the original PCB trace should not be connected at all.  I've not been able to create any glitches or crashes / lockups since doing this.  Only time will tell whether its a perfect fix but it does seem to be working for me with my 72 pin N8 on the Famicom here.   There are so many variables and really it needs someone more experienced to take a look I think, but it does seem to have solved my problems with my Famicom.

I tried your modification today, and I *think* it is working okay. Thank you! Would you mind, however, checking Metroid on your end? That was one of the games I was having trouble with, and I seem to still be getting some strange graphical anomalies and random resets.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on August 20, 2016, 04:08 PM
Are all of you using an original Famicom? or a a Famicom AV?
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 21, 2016, 09:00 PM
Original Famicom!  I will check Metroid later!
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on August 21, 2016, 11:10 PM
Hmm, i checked on my Famicom AV Bubble Bobble and Castlevania 3 (both US and JAP versions) and they worked fined, played for 10+ minutes without a problem.
That's why i think that the problem originates from the original Famicom, will have to do some testing for that though.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 22, 2016, 01:17 AM
Test SMB2 & 3 as well - those were glitching as well, resets and lockups.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: immrbig on August 22, 2016, 10:05 AM
I am using a Famicom AV.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on August 23, 2016, 04:11 PM
Tested SMB2&3 - 2 would freeze up in seconds, 3 works fine. Tested in my frontloader, the rom itself is fine..
Did you manage to find some sort of fix for it?
I was told in the past by Bob from RetroRGB that he heard that someone is making an adapter that has everything fixed, maybe we should just wait..
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 24, 2016, 12:18 AM
Yes, you've described the issues I had with SMB2!   That's good news!!  I did another fix last week that I finally posted today:-

https://www.youtube.com/watch?v=mOFHj3Bw9Bc
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on August 24, 2016, 10:37 AM
Wow great job! Would you recommend adding the copper plate or adding a resistor?
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 24, 2016, 11:09 AM
I would start with the Copper tape - it's much less destructive to the board, easier to do and will very likely fix the problem without needing that resistor.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on August 24, 2016, 03:50 PM
Great! ordered some right now. Will check it out once it gets here and let you know if everything works.
Again, thank you for researching it and finding a solution, once i see how it works for me i will update the guide.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: thecavalry on August 28, 2016, 12:47 AM
Copper tape definitely made the adapter infinitely less glitchy for me. I couldn't get the solder to flow over to where i scratched off the coating. I ended up just running a wire to ground from my solder bead. I have not added the additional capacitor/resistor.

I tested with the Everdrive N8 loading bubble bobble for about 10 minutes without any resets. I also tested with the super mario adventure romhack (which i would get crashes on regularly) and found no issues in the few minutes I spent with it.

I also confirmed it works with SMB2 cart without issues, though I hadn't tested prior to adding the tape. However, I can't seem to get my Metroid cart to work with the adapter. The game itself runs fine from my everdrive, but my cart doesn't seem to want to do anything but hold on the grey screen.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 28, 2016, 01:54 AM
Make sure you smooth the ripples out of the tape as well - just rub over it with tissue or something to flatten it and remove ripples.  Strange that you've still got a problem with Metroid, maybe the 100ohm resistor on the M2 line (and isolation of the existing M2 trace) is required after all.  I cannot get mine to glitch at all now and Metroid works fine for me.  With regards to not being able to solder onto the scratched off ground trace - it sounds like you need some flux!   Thanks for testing!  I've heard from a friend that his is working perfectly also, so it's looking promising!
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: thecavalry on August 28, 2016, 02:54 AM
Not needed in this case. I went and gave it a thorough cleaning with a bit of an abrasive cleaner to make sure corrosion wasn't the culprit. (It was particularly dirty from an ebay seller - and I had gotten it to work on my front loader NES with just alcohol/q-tips)

My Metroid cart is completely clean now, and fired right up without any troubles through the adapter. So, it seems the copper tape shield is the magic solution after all.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 28, 2016, 10:54 AM
That's awesome news!!!  Thanks for posting!  =D
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on August 28, 2016, 11:37 AM
That's great news! I wish mine would arrive already.
I want to make sure, where did you solder the copper to? on nesdev it seems that pin 1 and 72 are the ground ones. Am i correct?
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 28, 2016, 01:02 PM
Yes, ground is pin 1 or pin 72 on the 72 pin connector!
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: immrbig on August 29, 2016, 04:37 AM
Copper tape, in combination with the 100 ohm resistor AND a capacitor (I used a 47 pF ceramic cap, because that's what I have on hand)  seemed to have fixed my NES ED N8 crashes on my Famicom AV.

However, I was getting some noise in my picture because of insufficient grounding for the copper tape. In addition to the via in the video, I also grounded the tape to pin 72 on the NES side and pin 16 on the Famicom side. I only noticed marginal improvement after grounding to the Famicom side, but grounding the tape to pin 72 on the NES side made a big difference.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on August 29, 2016, 11:30 AM
That's great news!  Fascinating your cart needed grounding in 3 places, very odd.  I would have expected ground to be ground, unless one of your vias is introducing resistance or something - maybe a bad via?  In any case this makes 4 counts of it solving all the problems now!  Thanks for doing the mod, and for sharing your experiences related to grounding on the AV Famicom.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on September 09, 2016, 03:46 PM
Great! ordered some right now. Will check it out once it gets here and let you know if everything works.
Again, thank you for researching it and finding a solution, once i see how it works for me i will update the guide.

How did you get on?  I was hoping to hear positive new and that would make 6 out of 6 where it fixed the issues!   I really wish someone would test this on an Analogue NT, because I believe the same issue is affecting that system with the ED too.  I did consider buying one but they seem to be around the $500 plus mark which is insane imo.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on September 10, 2016, 01:23 PM
Great! ordered some right now. Will check it out once it gets here and let you know if everything works.
Again, thank you for researching it and finding a solution, once i see how it works for me i will update the guide.

How did you get on?  I was hoping to hear positive new and that would make 6 out of 6 where it fixed the issues!   I really wish someone would test this on an Analogue NT, because I believe the same issue is affecting that system with the ED too.  I did consider buying one but they seem to be around the $500 plus mark which is insane imo.
Did not receive the copper tape yet. As soon as it arrives I will comment here, and i will fix the guide. I'm sure it will work since we have enough evidence to support it :)
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on September 16, 2016, 05:19 PM
It's working! Great Great job GadgetUK, i will update the guide soon with some pictures. I did a pretty bad job with fitting and taping the copper tape, so if anyone has some better work i would like to use their pictures if you can.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on September 17, 2016, 03:07 PM
It's working! Great Great job GadgetUK, i will update the guide soon with some pictures. I did a pretty bad job with fitting and taping the copper tape, so if anyone has some better work i would like to use their pictures if you can.

Awesome!!! That's 7 out of 7 where this has worked, so it's safe to say it is a fix for these adapters.  I think the same fix will work when trying to use an N8 on the Playchoice 10 (I've contacted a chap on YT and he's going to try it), and I believe the same problem is happening with the Analogue NT and N8 - but in that case I suspect the shielding wants to go over the NT main board cart traces, and I don't know anyone with an NT that has the skills to attempt this fix (yet).
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on September 22, 2016, 09:49 PM
Can someone please check Kirby's Adventure (U) (PRG1) [!] for me? when i run it with the mod it works fine until stage 1 level 4, and gets stuck in the middle there. in my nes it works fine
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on September 22, 2016, 10:42 PM
Will check it out but pretty sure I got past that stage last week!  Have you made sure the copper is smoothed flat by wiping over it?  Also check cart and socket edges are clean.  I've still not had a single fault since doing the mod!  Don't forget, I also have a seperate wired m2 line via 100ohm resistor too.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on September 27, 2016, 08:14 PM
As well as making sure copper tape is rubbed flat, make sure there's nothing on the PCB underneath.  I had someone tell me it wasn't working 100% - he had placed insulation tape on the PCB first, with copper tape on top of that - that won't work, the copper tape has to be as close to the traces and vias as possible.  Also check ground is good, and contacts on both edges of adapter are clean, and famicom slot is clean.  Slightly dirty ground connection won't help.  I also suspect that having severed m2 line at both ends, and replacing with a wire in series with 100ohm resistor helps, because then the m2 clock cannot interfere with nearby traces
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: thecavalry on September 27, 2016, 08:49 PM
Still no issues here on my end to report. I didn't bother cutting the m2 trace. I just have the tape on the front(?) side, grounded, and wires for mmc5 and expansion audio resistors on the back.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on September 28, 2016, 11:12 AM
Thanks, i will try to put the copper tape again. maybe i'll give it to someone who knows how to make sure its flat :P
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on September 28, 2016, 09:30 PM
Rub over the tape with a rag or something! All the ripples and bubbles vanish and it's then totally flat!
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on September 29, 2016, 03:29 PM
Allright! I removed the old tape and put some new one. Kirby works great now!
One thing that i noticed is with the old tape, the N8's self diagnosticte test gave chr: error 03 (on the NES itself it was fine) and now all tests are OK. maybe i did something wrong there.
Oh well, it works!
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: GadgetUK on October 23, 2016, 12:22 PM
Allright! I removed the old tape and put some new one. Kirby works great now!
One thing that i noticed is with the old tape, the N8's self diagnosticte test gave chr: error 03 (on the NES itself it was fine) and now all tests are OK. maybe i did something wrong there.
Oh well, it works!
Great stuff!  Very interesting you got that error 03 - When I get another unmodified adapter I will test the diagnostics to see what it reports.  I've not had a single problem since doing the mod.   We just need someone to try the same copper tape fix on the Analogue NT motherboard cart traces now because I suspect that could solve the similar glithes that system has with the N8.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Bluesteel on August 01, 2017, 07:44 PM
Hi I tested the pins and found that you can't go off of the printed "1" that is on the pcb. Pin one for the nes side is actually on the right and not the left. The "1" for the fami side is correct.

So in your picture of the adapter with the copper shield you are actually connected to pin 36 which is 5v. I would use the spot just to the right of that where you cut and folded the copper. That runs to pin 72 and is also ground.

I used a pin out guide and then checked every pin connection to verify how it's wired.
Link:
http://nesdev.com/NES_ADAPTER.txt

More info:
I have a nes everdrive and a Av famicom 2nd gen. The unmodded adapter would work for real carts but with the n8 I got errors and random characters appearing in the n8 menu. Lots of glitches and crashes.

this mod hasn't fixed mine yet, I'm awaiting some components before I try again. I was using 2watt resistors and ordered some 1/4 watt. I use metallic film. Also my shield is connected to 72, initially it was on 36 like you're picture.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on August 02, 2017, 10:05 AM
Hi I tested the pins and found that you can't go off of the printed "1" that is on the pcb. Pin one for the nes side is actually on the right and not the left. The "1" for the fami side is correct.

So in your picture of the adapter with the copper shield you are actually connected to pin 36 which is 5v. I would use the spot just to the right of that where you cut and folded the copper. That runs to pin 72 and is also ground.

I used a pin out guide and then checked every pin connection to verify how it's wired.
Link:
http://nesdev.com/NES_ADAPTER.txt

More info:
I have a nes everdrive and a Av famicom 2nd gen. The unmodded adapter would work for real carts but with the n8 I got errors and random characters appearing in the n8 menu. Lots of glitches and crashes.

this mod hasn't fixed mine yet, I'm awaiting some components before I try again. I was using 2watt resistors and ordered some 1/4 watt. I use metallic film. Also my shield is connected to 72, initially it was on 36 like you're picture.
Hi, can you please upload pictures of your board? i used the same pinout to verify when i did my mod. maybe something is different on yours, i want to compare it to mine.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Brachabre on March 29, 2018, 07:43 AM
I just did this mod to my eBay 72-to-60-pin adapter with shell. My console is a jp AV famicom.

Had a lot of troubleshooting and re-soldering (I do own a Hakko FR-300 desoldering iron  ;D ) until eureka, but it was nice to finally hear the famicom expansion audio games sound just right to-my-ears after the mod.

I first experimented by installing two 56k ohm resistors. I got visuals but mute audio and silent black screens. I re-soldered the wires and 56k resistors twice.  I then tried two 15k ohm resistors in parallel. Desoldering irons that have vacuums are a bless'n.

The audio sounds balanced enough for my liking. The VRC7 audio balance is excellent. I use an Everdrive NES N8 and its most current VRC7 mapper. VRC6 sounds off-balance, but I think one of you guys posted a series of VRC6 mappers where you can swap out different VRC6 volume versions. Gimmick jp sounds well-balanced and great. Castlevania III NES looks and sounds great.  No flickering black lines or graphical glitches.


Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: W_W_P on April 16, 2018, 06:45 PM
Hi, I tried to solder the 10Kohm resistors to the adapter but the sound still doesn't work. Did I do something wrong?

I attached a picture that shows my work and it ain't pretty but I don't see why it wouldn't work.

(https://i.imgur.com/TxAciyz.jpg)
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: flex on May 08, 2018, 07:35 PM
Hi Guys!

I have been monitoring this post with interest, I have an AV Famicom on the way from a mate who is currently on holiday in Japan so I am looking to purchase an adapter to use my Everdrive N8 NES Edition with.

I am based in the UK and I am looking to purchase this adapter and then do the mod (mainly for Castlevania 3 Audio!)...

This looks like the correct adapter as the shielded ones seem a tad expensive.

https://www.ebay.co.uk/itm/New-NES-to-Famicom-Converter-Adapter-72-pin-to-60-pin-Good-Quality-/282311629148

Can you confirm this is the best adapter to get? Also is there anywhere you can purchase a pre modded adapter or anyone that could do the work for me? While I am fairly confident I could attempt the mod myself my soldering isn't the best and I don't have that much spare time.

Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: flex on July 17, 2018, 11:59 PM
Update to my previous post...

After receiving my Famicom AV I ended up selling my Everdrive N8 NES version and purchased the N8 Famicom version in the end as thought that made more sense as no messing around to get expansion audio working!

I therefore no longer needed the Expansion Audio mod on the adapter however I just used this guide to do the MMC5 compatibility mod only on the 72 to 60pin adapter and this has worked perfectly with my US copy of Castlevania 3. So just wanted to say thanks very much for all the useful info!

One thing I don't think is made very clear though is that the Famicom pins are counted backwards on the rear of the adapter so pins 31 - 60 go from right to left where as the top row for the NES pins 37 - 72 go from left to right. I had to check and double check I had the correct pins a few times as this wasn't totally clear in any guide I came across fortunately it is kind of easy to tell you have the right pair of pins as you can see where the pins are joined together.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on July 20, 2018, 07:24 PM
Update to my previous post...

After receiving my Famicom AV I ended up selling my Everdrive N8 NES version and purchased the N8 Famicom version in the end as thought that made more sense as no messing around to get expansion audio working!

I therefore no longer needed the Expansion Audio mod on the adapter however I just used this guide to do the MMC5 compatibility mod only on the 72 to 60pin adapter and this has worked perfectly with my US copy of Castlevania 3. So just wanted to say thanks very much for all the useful info!

One thing I don't think is made very clear though is that the Famicom pins are counted backwards on the rear of the adapter so pins 31 - 60 go from right to left where as the top row for the NES pins 37 - 72 go from left to right. I had to check and double check I had the correct pins a few times as this wasn't totally clear in any guide I came across fortunately it is kind of easy to tell you have the right pair of pins as you can see where the pins are joined together.
I've done the same, switched to a famicom version just to get rid of the hassle.
I will try to see if i can make it a little clearer, thanks for the feedback.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: yee on July 31, 2018, 10:43 AM
Could someone reupload the pictures from the OP? Seems like they have broke.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on September 27, 2018, 10:02 PM
OK, i re-uploaded the images and added a note on the way pins are counted. Sorry it took a long time.
If there is anything else let me know, lets hope this time the images wont go down.
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: SkinnyV on October 11, 2018, 11:37 PM
Hi, I tried to solder the 10Kohm resistors to the adapter but the sound still doesn't work. Did I do something wrong?

I attached a picture that shows my work and it ain't pretty but I don't see why it wouldn't work.


I would advise against putting big solder joint like this on the connector, you are going to end up damaging your NES cart connector. What you should do instead is solder a bit of thin wire (kynar is the best for this) to your resistor and solder the other end of wire at the highest portion of the cart edge connector to minimize the pressure to the connector pins. Here is a picture from a different mod (CIC mod) I made showing what I am advising you to do. It's not a resistor but same principle apply.


Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Eunos on October 30, 2018, 09:00 AM
I'm wondering if the capacitor mod on the pin adapter is meant to address a major issue I'm having with crashes.

My setup:
NES EDN8
AV Famicom
72-to-60 pin adapter
Genesis Model 1 power supply.

This short video shows the issue.
https://youtu.be/4jN6I7CxHug


Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Barawer on October 30, 2018, 11:45 PM
I'm wondering if the capacitor mod on the pin adapter is meant to address a major issue I'm having with crashes.

My setup:
NES EDN8
AV Famicom
72-to-60 pin adapter
Genesis Model 1 power supply.

This short video shows the issue.
https://youtu.be/4jN6I7CxHug
Have you tried running the self test to make sure the cart itself is fine?
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Eunos on November 03, 2018, 08:47 PM
Just ran self-test.  All OK.
The N8 has worked perfectly fine in my unmodded NES-001 since 2016.

The video in my previous post showed immediate crashes when powering on, with errors 62-64 and error 10. This was without any mod to the pin adapter in the RGB AV Fami. I've since successfully corrected the MMC5 and expansion audio using your mods. Thank you so much for that. :)

The N8 issues persist. With only the severed M2 traces and a new line+100hm resistor, and a 20pF OR 75pF cap across 5v and ground, the result is this (4 second clip): https://gfycat.com/WhichAcrobaticAustraliankestrel
In this state, a crash will occur the moment I attempt to load a ROM. Picture of mod for reference to video: https://imgur.com/a/EMXywXj

I've tried a few times at GadgetUK's copper tape fix. My best effort allowed me to load and play ROMs for an indefinite amount of time, but with the "static" lines. That is exactly how well the NES N8 was working with stock pin adapter in the stock AV Fami.


Thank you for your time.  I'm going to try again later so I'll update if there's any news.

Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: barryconvexx on December 30, 2019, 11:40 PM
I have an AV famicom and a Everdrive N8 Nes version. I am getting lockup on games after playing for 10 minutes or so.

Couple of questions


Thank you
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: KRIKzz on December 31, 2019, 12:14 AM
I have an AV famicom and a Everdrive N8 Nes version. I am getting lockup on games after playing for 10 minutes or so.

Couple of questions

  • Is there a chance that this is a different problem to the one addressed in this thread and I just need a new SD card? Im using an old SD card, and was going to get a new one, but my current one is working fine otherwise. Its just this locking up issue.
  • Is there a solution available that does not involve soldering? For example is there an adapter available now that solves this off the shelf?

Thank you

This is for sure not related to sd card, but another adapter has chance to solve the problem, because some of them has really bad design. Also make sure that it not a problem with contacts
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: barryconvexx on December 31, 2019, 12:20 AM
Ok great thank you.

Is there a recommended adapter that solves this problem?

For example would this one work? (its from the same place I bought the N8)
https://www.retrotowers.co.uk/nes-to-famicom-adapter
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: kzd on March 08, 2020, 12:53 AM
Attempting this mod and wanted to clarify some things, since it seems like there's a lot of varying opinions/drection floating around:

Lastly, any tips on soldering the jumper wires to the pins? I'm using 26AWG stranded wire, so it's not terribly huge, but I keep having issues with making clean joints, since I somehow always end up bridging the pins.  ::)

Thanks everyone!
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: kzd on May 03, 2020, 10:56 AM
Gave it another go, and I eventually got it working. You do need to cut the trace connecting pins 57 and 58 on the NES side of the adapter, otherwise MMC5 games will not work correctly. I verified this using L'Emperur (US). I haven't fully verified that expansion audio works, since I don't have a NES ED nor any NES carts wired to send expansion audio, but once I get something to test that with, I'll report back.

Lastly, some tips for soldering this up:

Have fun, and thanks for all of the helpful information in this thread!
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: kzd on May 03, 2020, 11:27 PM
Quick report back - confirmed expansion audio works by testing one of my NES conversions through the adapter on an AV Famicom.

One thing I am noticing is crazy audio buzzing, and I think it's due to the adapter. When I plug my N8 in, and run the same game off of that,  there's no audio buzz. Anyone have any ideas on what might be the cause?
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: nuu on May 04, 2020, 04:09 PM
Noise introduced by the adapter. Is there any unecessarily long wires, excessive solder or anything else that could act like an antenna?
Title: Re: Nes (72-pin) to Famicom (60-pin) converter mod
Post by: Bassguy on May 11, 2020, 01:00 AM
I'm having some of the same graphical issues as Kunos does anyone have any ideas? I have noticed the Retrofreak NES to FC adapter has some different values of capacitors and resistors on its board I may see if I can borrow some of the design elements from that board to mod this cheaper convertor.