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NAC Splitfire: JAMMA streaming solution

Can anyone offer guidance on building a VGA to SCART cable for the Spitfire, for use with OSSC and Retrotink 5X?

I had a beatup genesis 1 scart cable lying around, so cut the genesis connector (that was the beat up part...it was basically unuseable) and soldered wires to a male VGA head per the below.

All connections are pass-thru, no termination or attenuation. I'm getting heavy color ghosting, and there's no amount of adjustment of the video gain knob that gets it right.

I'm sure there's some termination or something else needed in the cable, but I'm not smart in those ways. :) Any help appreciated.

SCARTVGA
Red151
Red ground136-8 bonded together
Green112
Green Ground96-8 bonded together
Blue73
Blue ground56-8 bonded together
Sync2013
Shield groundmetal housingmetal housing
 
Hi everyone, as a few of you are already aware (thank you!) pre-orders for the next batch of Splitfires are open. The units are currently in production and should be in hand by early Q3. This is the last run we will be doing in 2023.

Unfortunately, due to component costs and a higher-than-expected tariff from the last batch, the price has increased slightly. As much as I hate to do that, it's necessary to keep producing these, so thank you for your understanding.

Pre-orders are live here: https://birdlandarca.de/products/splitfire

Thank you all for your continued support of this amazing product!
 
YesAffinity said:
Can anyone offer guidance on building a VGA to SCART cable for the Spitfire, for use with OSSC and Retrotink 5X?

I had a beatup genesis 1 scart cable lying around, so cut the genesis connector (that was the beat up part...it was basically unuseable) and soldered wires to a male VGA head per the below.

All connections are pass-thru, no termination or attenuation. I'm getting heavy color ghosting, and there's no amount of adjustment of the video gain knob that gets it right.

I'm sure there's some termination or something else needed in the cable, but I'm not smart in those ways. :) Any help appreciated.

SCARTVGA
Red151
Red ground136-8 bonded together
Green112
Green Ground96-8 bonded together
Blue73
Blue ground56-8 bonded together
Sync2013
Shield groundmetal housingmetal housing
Click to expand...

I'm pretty sure this was made among other reasons to pair with Retrotink5x, given the native SCART input on that device and lack of included HD15 port. I havent tried this yet with OSSC (I personally just feed the HD15 input from the Splitfire output, thats worked well for me):

https://castlemaniagames.com/products/rondo-products-hd15-2-scart
 
BroadwayJose said:
I'm pretty sure this was made among other reasons to pair with Retrotink5x, given the native SCART input on that device and lack of included HD15 port. I havent tried this yet with OSSC (I personally just feed the HD15 input from the Splitfire output, thats worked well for me):

https://castlemaniagames.com/products/rondo-products-hd15-2-scart
Click to expand...
Yeah, I'm aware of that product, but it's out of stock. So, I've been trying different options for making my own SCART cable/connection, all with the same result of oversaturated/bleeding colors and dropped sync, on RT5X, CRT and OSSC SCART input.

Per the Splitfire product page, sync output should be 0.7vpp, which should be good for RT5X/CRT/OSSC SCART input, but should not be good for OSSC's vga input. The OSSC wiki states "RGBHV and RGBS modes require clean TTL-level sync signals". I have no problem with the output from Splitfire direct into OSSC AV3 via standard VGA cable, and as mentioned above, devices that should work fine with a 0.7vpp signal do not like the output.

@opt2not notes earlier on page 33 that he built a cable with success in the same fashion that I have:
https://www.arcade-projects.com/threads/nac-splitfire-jamma-streaming-solution.7200/post-294561

I've tried adding a 470 ohm (and other values) resistor on the sync line, with no better results. I've tried running all connections straight (verified with multimeter continuity testing).

I'm probably missing some simple detail, but really racking my brain on this one.
 
Last edited:
Hi everyone, I just wanted to let you know I received the latest batch from the factory. All orders placed to date are packed and going out today.

PXL_20230623_173434444.jpg


Thanks again to everyone for their continued support of this product!!
 
Just to clarify, the Splitfire's sync output is buffered from a 74HCT-series IC, and should be at typical 5V TTL levels, but has a 470 ohm resistor in series with the sync signal going to pin 13. If the sync signal is not being terminated, like with a typical TTL logic input, the 470 ohm resistor will drop virtually no voltage and thus should be compatible with such an input. On the other hand, if the sync signal is connected to an input with 75-ohm termination - like on a PVM's sync input - the series 470 ohm resistor and the sync input's 75 ohm termination resistor form a voltage divider that comes out to 0.69V, which for all intents and purposes is the desired 0.7V.

I use it connected to an OSSC's VGA input port directly, and from the start that's been the recommended use case.
 
Hi,
Has anyone managed to get a full picture with Splitfire & OBS?
I only managed to get the left half?
Thanks.
 
Slot MVS ->Splitfire -> VGA Cable -> Xcapture-1 -> OBS (last version).
 
Just providing the update that I got a Rondo HD15-2-SCART and it works great with the NAC Splitfire to RT5X. I now have all of my NAC Splitfire use cases covered. Very excited to be able to output arcade boards easily to the RT5X with glorious crt simulation. :)
 

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How I fix the 100% CPU Bug with X-Capture on Windows 10 and 11 :

1-Create file with block-note (Windows).
2-Copy :
Code: 
@echo off
PowerCfg /SETACVALUEINDEX SCHEME_CURRENT SUB_PROCESSOR IDLEDISABLE 000
PowerCfg /SETACTIVE SCHEME_CURRENT
3-Save with the name 100%CPU_Killer.cmd (select ALL FILE in Type when you save the file).

How to use :
When the CPU bugs at 100%, launch 100%CPU_Killer.cmd
 
Hello,
Today I have a problem with my NAC Splitfire, I have no sound by jack.
I have tested the potentiometer :
1-3 : 0 to 600 Ohms
1-2 : 0 to 600 Ohms
2-3 : 0 to 600 Ohms


lll.png




How can I test the jack ?


ll1.png

Now it works... I don't understand.
 
Last edited:
Its because that is a failure point. Happened to me as well. The solder on top side of board but under pot had failed or a wiper leg has broken
 
I used it all day, on AW and MVS slot, I no longer had any problems.
 
hello, I bought a splitfire nac and unfortunately I can't get an image with it for my stream setup. My configuration is ossc + avermedia live gamer portable 2 . Do you have a solution? THANKS
 
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