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JAG2GEN Information & Troubleshooting

Technical Specs

Output SignalsAudio L & R, Audio Mono, CSYNC, RGB, Composite Video, 5v
Output Resolution240p*
Voltage Output5v
Current Output100-150mV
RGB FilteringPassthrough. No filtering of the Red, Green, or Blue signals
Sync TypeCSYNC attenuated with a 680 ohm resistor and 220uf capacitor
Supported CablesHD Retrovision Genesis YPbPr Component Cable (Recommended), Genesis Model 2 SCART**, Genesis Model 2 composite cables
Tested ScalersList will be updated as we are able to test more scalers:
GBS Control, OSSC, RetroTINK 2x Pro, RetroTINK 5x Pro
Untested ScalersConsider these unsupported
Rad2x, Framemeister

*Some modern HDTVs aren’t able to display 240p signal, the native video resolution of the Atari Jaguar. It is not a limitation of the JAG2GEN but rather your TV. To support your Atari Jaguar on a TV that does not support 240p signal, you should consider buying a scan converter of some kind.
**SCART cable components vary. Some use CSYNC other use Composite on SYNC and most filter the RGB signals. If you plan to use a SCART cable with the JAG2GEN, you may need to modify the cable to work properly with the Atari Jaguar as they were intended to be used with the Sega Genesis. This isn’t a limitation of the JAG2GEN but rather an expectation of SCART and the Jaguar’s RGB and Sync lines.

FAQ

What is the JAG2GEN?

The JAG2GEN is an adapter that simply converts your Jaguar’s AV signal to that of a Genesis (model 2 or 3*) AV cable.

Will it make my picture quality look better

Not by itself. The JAG2GEN just outputs the same signals that your Jaguar does directly but for the more common 9-pin mini din Genesis socket. We highly recommend using a modern scaler like the OSSC to get the best picture quality out of your Jaguar.

What type of Sync is used in the JAG2GEN?

CSYNC – attenuated with a 680 ohm resistor and 220uf capacitor. You may need to modify your SCART cables accordingly!

Will my Sega Genesis SCART cable from [Company Name] work without modification?

Not necessarily. SCART cables are bit like the wild west and without knowing exactly how it was built we can’t say whether or not it will work without modification. What we can say is out JAG2GEN adapter attenuates CSYNC with a 680 ohm resistor and 220 uf capacitor. All RGB signals are unfiltered as the Jaguar does not require further filtering. This information should be adequate to help you figure out whether or not your SCART cable will work with the JAG2GEN without modification.

Are the RGB lines filtered?

The JAG2GEN’s RGB signals are PASSTHROUGH, not filtered, since the Atari Jaguar already filters its RGB signals internally.

What are OSSC optimal timings for the Atari Jaguar?

OSSC Profiles will need some tweaking to fit your TV and Cable needs. Here is a good starting point:

Video in proc
Video LPF = 35MHz

Sync opt.
Analog sync LPF = 10MHz (med)
Analog Sync Vth = 180 mV (Only for SCART with CSYNC)

Output opt.
240p/288p proc = Whatever lineX mode you prefer.
LineXx mode = 320×240 optimal

Sampling opt.
Adv. timing > 320×240:
H. samplerate = 422
H. synclen = 31
H. backporch = 23
H. active = 360
V. synclen = 3
V. backporch = 11
V. active = 240
Sampling phase = 303 (this can vary)

Credit: FirebrandX

Troubleshooting & Known Issues

  1. Gird like pattern on some colors
  2. Rainbow colored dots or patterns
  3. Flickering while using RetroTINK
  4. Distortion or “waves” across the screen
  5. Smearing or blurring on light to dark colored objects

There is a grid like pattern on some or all colors

Impacts Composite, S-Video, and some SCART cables

  • Cable: Any sort of artifacts on images is typically due to poor cable quality. The first thing you should do is try to rule out your current cable with a new one.
  • Scaler: Some scalers will add additional processing to the images causing artifacts. Scalers also take any poor video quality and upscale them making them more noticeable. Try to adjust the scalers settings to mitigate the processing of the image.

Image is a representation of the issue

There is a rainbow like dots or pattern around some objects

Impacts Composite and some S-Video cables

  • Composite Video: Dot Crawl and “rainbow” video noise is inherent to Composite Video Source. Even with perfectly good composite cables, you will most likely still see this issue. It is typical of the video source.
  • Scaler: In combination with composite video source, scalers can make this issue more apparent since you are taking a video signal with noise and upscaling it.

Image is a representation of the issue

Flickering screen on some games when using a RetroTINK

Impacts HD Retrovision and SCART cables

  • Comb filter: If you’re experiencing flickering in some games while using the RetroTINK, slide the “COMB” switch to “Retro” to help mitigate this.

Intermittently “waves” or distortion across the screen

Impacts cheap SCART cables

  • Cables: Cheaply made SCART cables typically aren’t shielded or grounded properly. Without proper ground or shielding, you will see noticeable cross talk or wave like distortions on the screen.

Image is a representation of the issue

Smearing or blurring on light to dark colored objects

Impacts SCART, S-Video cables, untested Scalers

  • Cables: Cheaply made SCART and S-Video cables can cause an afterimage “smearing” effect where a light and dark object intersect. As always, make sure you’re using good quality cables. The photo shows Insurrection SCART cables through an OSSC set to “Generic 4:3”.
  • Scaler: we’ve heard that some scalers are causing this issue. Specifically the Framemeister. We can’t confirm this ourselves because we have don’t have a Framemeister for testing, which is why we consider it unsupported. The photo in this section is NOT an output of the Framemeister.

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