RJ-45 Multi Console Cthulhu Arcade Stick Tutorial Ver.2


Figured it’d be Windows… Lucky me inherited a PC from my dad, though!

I can offer SOME good news, though.

I got my Saturn cords RJ-45 adapted already. Took about 75-80 minutes of work for all three. It appears that the color labeling for the wiring is consistent for Sega, Hori, and Ascii brand connection cables. Verified this by my multimeter.

Here’s the color by wire going from left-to-right by Pin Position on the RJ-45 –
White (1) Black (2) Green (3) Grey (4) Orange (5) Red (6) Yellow (7) Blue (8)

Again, this is consistent among the 3 brands of Saturn connectors I have. More good news is that the stock connector lengths are plentiful. They range from 5-feet-plus to just under 10 feet!

I just cut down the 9th wire (the Brown) so that it didn’t interfere with the other wires. Brown should be Pin Position #6 on the Saturn’s connector end – the Pin Position we were told to skip.

I still double-checked on each wiring bundle to be sure before I crimped on the adapters.


Ha! I do that shit every time too. You think that because it was just 3 wires it would be more simple huh?

Also added information about Din Connectors.


Outstanding contribution, RTdzign ! I’ve been reading the R45 mod 2.0 plus this and everything is very well explained . Will be very handy shortly.

EDIT: However, the diameter of my Neutrik connector (NE8FBV) was 22 mm rather than 24 - confirmed on Neutrik’s web site.

Absolute Question and Answer Thread v.3 (ASK YOUR QUESTIONS HERE!)

So the Switchcraft RJ-45 feedthrough would also work with plastic/metal/thin holes right?


It will work anywhere you can hold it in place with two screws or a small bolt and nut.


Also, any Cat5 cable will do right? No benefits using regular (leftover) Cat5 over Cat5e/6?


I use leftover cat 5 cables. They work fine.


Quick question: I made a cable for NES, but when I plugged it in, it made my screen go blank and my system lock up. From the looks of it, the cable was the same as SNES just with the wires for 2 and 7 switched around. Any idea what might be the issue or what wires I might have misdone?


I suggest that you take a multimeter and triple check the pins to the RJ-45. Also I would boot the system up with the cord already in the system and then plug the ethernet jack end into the stick. NESes are prone to reset if you slightly move the system. Also double check this instructable by Toodles himself. I suggest that you just forget about the purposes of the wires and the similarities betweenNes and Snes circuit design and treat them like totally different systems. Just strictly think of the pin numbers to the G-V rows.


Hello, I am having trouble getting my Xbox1 cable to work with my MC Cthulhu RJ45 mod.
I have checked all the connections and they seem fine. I have also checked the MC Cthulhu board for voltage when connected to my Xbox1 and I get 4.53v.
Is there any other test I can do or do you have any ideas as to what it could be please?


did you update the firmware to 2.0? because the older firmware requires you to hold left (if I remember correctly) before plugging in the controller to activate xbox 1 mode.


Yeah. I thought it might be that after searcing the forums for answers. Unfortunatly it hasn’t worked.


Sorry man, there’s nothing special about the Xbox cable versus a regular USB cable except the funny end. If your stick will come up on a PC or PS3 properly, then it absolutely HAS to be a wiring problem in the Xbox1 cable.


Since the switchcrafts cannot be found in Europe, to the best of my knowledge, I used my router to fix the Neutrik connector to my wooden box.

The recess has been widened with a 45° router bit to ease access to the unlock button.
I left about 5 mm of oak for the Neutrik to sit

Damn, the connector is not exactly seated parallel to the sides :-/

Absolute Question and Answer Thread v.3 (ASK YOUR QUESTIONS HERE!)

Cheers Toodles, I’ll give it a go with another cable.
Does it matter that I have the RJ45 cable hooked up to row 2 on the Cthulu for the Xbox1 cable and the USB output for PS3/PC?


Nope. But it would be best to test out the RJ-45 with a RJ-45 -> USB cable. That a way, if the Rj-45 USB cable worked on a PC/PS3, then you’d know for sure the problem was with the RJ-45 -> Xbox cable. If the USB cable didn’t work, then you’d know the problem was on the INSIDE dealing with the RJ-45 jack and the wiring between the jack and cthulhu.


Yeah, I have the same problem trying to find the Switchcraft’s. You can get the Cat6 feedthrough versions in the UK, which seem a tad cheaper than the Neutrik Cat6 jacks, but that’s as close as I’ve got.

Alternatively, you could try a Switchcraft 15pin D Sub. The advantage to this is that you’d use SVGA plugs instead of RJ-45 plugs, and they offer a broader range of console support than a RJ-45 jack can - such as Neo-Geo.

Nice work on the routing by the way - shame it didn’t go quite to plan, but kudos for the attempt.


I wouldn’t mind a link or two :slight_smile: (I searched farnell’s catalog but didn’t find anything vaguely close to switchcrafts. Oh yeah, there’s Neutrik’s passthru but at 30 EUR a piece, it’s just too much money wasted - damn, their shit is gold-plated or what ?)

I went the neutrik route because there’re designed to be plugged/unplugged often, I don’t think this is the case with SUBDs, where you’re supposed to secure the connectors with screwdrivers…



Or just search for “Neutrik Cat6” on eBay.

AFAIK unplugging a D-Sub multiple times should be as stable as the 8 pin DIN method. I’ve seen a few people here (including Toodles) saying that RJ-45 connections aren’t always 100% solid for them, but not having used any other route yet I can’t personally say so either way.


The UPCB used D-sub 15’s, and never failed on me. I made sure to get d-sub hooks with thumbscrews so I could always screw down the cables without tools and still have a rock solid connection. The downside is that making cables with a d-sub end is much more expensive than crimping an RJ-45 end on.