Genesis Model 1 AV Port Adapter and Coax Cable Setup Guide
By Stone Age Gamer | Published: 2026-11-01
Category: How-to Guides
Use the HD Retrovision Model 1 adapter to run a Genesis 2 component cable on a Model 1, and upgrade to a 75-ohm coax cable for cleaner composite video and audio.
Quick answer
If you already own an HD Retrovision Genesis 2 component cable, add the Model 1 AV Port Adapter to connect it to a Model 1 Genesis or Master System. For composite or RGB setups on a Model 2, Model 3, Nomad, CDX, or 32X, use a 75-ohm mini-coax AV cable to reduce video ghosting and audio buzz.
Why the connector matters more than the cable brand
Sega changed the AV connector between the Model 1 and later Genesis revisions. The Model 1 uses a 262° 8-pin DIN, while the Model 2, Model 3, Nomad, CDX, and 32X use a 9-pin mini-DIN. A cable built for one will not physically fit the other, so the adapter is a mechanical and electrical bridge, not a signal booster.
That means you should choose your cable by the console you will actually use most, then add an adapter only when you need to cross generations. Buying a Genesis 2 cable and a Model 1 adapter is often cheaper than owning two full cables, but the adapter adds one extra connection point that should be kept clean and fully seated.
When a coax upgrade is worth it—and when it is not
A 75-ohm mini-coax cable improves shielding for composite video and audio, which can reduce the ghosting and buzz that cheaper cables sometimes introduce. It does not upgrade composite video to component or RGB; it simply carries the same signal with better construction.
If you already use HD Retrovision component cables, the coax composite cable is not a replacement for that path. Keep the component chain for your best display and use the coax cable on a second setup, a CRT, or a console where component input is unavailable.
Step-by-step setup
- Identify your console’s AV port: Look at the round AV jack on the back of the console. A Model 1 Genesis or Master System has the larger 8-pin DIN; a Model 2, Model 3, Nomad, CDX, or 32X has the smaller 9-pin mini-DIN. If you are unsure, check the model number on the bottom label before buying any cable or adapter.
- Choose the cable for your main console: For a Model 1 with HD Retrovision component cables, start with the Genesis 2 cable and add the Model 1 AV Port Adapter. For composite video on a Model 2-family console, use the 75-ohm mini-coax AV cable. Do not force a Genesis 2 cable directly into a Model 1 port; the pins will not align.
- Connect the adapter before powering on: Plug the male 9-pin mini-DIN end of the HD Retrovision Genesis 2 cable into the female side of the Model 1 adapter, then plug the adapter’s male 8-pin DIN into the console. Power on only after both ends are fully seated. A partially inserted adapter can cause missing colors or sync dropouts; push until it stops.
- Route the cable and check for strain: Keep the adapter and cable supported so the weight does not pull down on the console’s AV port. Avoid bending the cable sharply at the connector. If the picture cuts out when the cable moves, reseat the adapter before assuming the cable is faulty.
- Test video and audio separately: Display a game with known bright colors and stereo or mono audio. Check for ghosting, color bleed, or buzz. Compare the coax cable against a basic AV cable if you have one. A cleaner image with the coax cable confirms shielding is helping; no change means your original cable was already adequate.
Product facts
- Model 1 AV Port Adapter - HD Retrovision: The HD Retrovision Model 1 AV Port Adapter converts a male Genesis Model 2 9-pin mini-DIN connector to a male Model 1 262° 8-pin DIN connector. It lets an existing HD Retrovision Genesis 2 component cable work with a Model 1 Genesis or Master System without buying a second cable.
Model 1 AV Port Adapter - HD Retrovision - 75 Ohm Mini Coax Gold Plated AV Cable for Sega Genesis Model 2 & 3, Nomad, CDX, and 32X: The Retro Frog 75 Ohm Mini Coax Gold Plated AV Cable uses 75-ohm mini coax for all AV signals, including composite video and audio, with foil and spiral shielding. It is a direct-fit composite AV cable for Genesis Model 2, Model 3, Nomad, CDX, and 32X consoles that can reduce video ghosting and audio buzz compared with unshielded cables.
75 Ohm Mini Coax Gold Plated AV Cable for Sega Genesis Model 2 & 3, Nomad, CDX, and 32X
