N64 S-Video: The Best Stock Signal and How to Use It on a Modern TV

What S-Video Is and Why It Beats Composite

Standard composite video combines everything, brightness, color, and sync, into a single signal on one wire. That seems simple, and it is, but it comes with a problem. When the decoder inside your TV tries to separate the color information back out from the combined signal, the process is imperfect. The result is dot crawl (a shimmering, crawling pattern along high-contrast edges) and color smearing into adjacent areas.

S-Video (also called Y/C) solves this by keeping the signals separate before they ever leave the console. It carries two signals: Y (luminance, which is the brightness and detail information) and C (chrominance, which is the color information). Because the TV receives them already separated, it never has to decode them from a combined signal. The dot crawl artifact goes away, edges are sharper, and colors are more accurate.

On the N64 specifically, the improvement is meaningful. The N64's output has enough detail that composite's blurring noticeably softens it. S-Video reveals that detail cleanly.

NTSC vs PAL: Which N64s Output S-Video

NTSC N64 consoles, meaning the North American and Japanese units, output S-Video through the Multi AV Out on every revision. If you have a gray cartridge-top N64 bought in North America, you have S-Video.

The connector used is the Nintendo Multi AV Out, a 12-pin card-edge style port. This is the same physical port used on the SNES and GameCube, but what signals are available through it differs by console. On the SNES and GameCube, RGB is available. On the N64, it is not.

The S-Video Cable You Need

The official Nintendo N64 S-Video cable is the NUS-008. One end has a Nintendo Multi AV Out plug that fits the port on the rear of the console. The other end splits into two outputs: a 4-pin mini-DIN S-Video connector for the video signal, and a pair of RCA plugs (red and white) for stereo audio.

Third-party cables using the same connector work the same way. The connector is passive, so signal quality depends on the console's analog output stage, not on the cable manufacturer. A reasonable third-party cable produces the same picture as the official one. The S-Video plug carries only video. The RCA plugs carry left and right audio, and both are needed for sound.

Connecting S-Video to a Modern TV

Most TVs manufactured after around 2015 do not include S-Video inputs. Even TVs that have composite inputs, the yellow RCA jack, often dropped S-Video. If you plug the S-Video cable into your TV and there is nowhere for it to go, you need a converter in the signal chain.

The simplest option is a dedicated S-Video to HDMI adapter. Generic units are available for under $20 and produce acceptable results. They take the S-Video and audio RCA plugs as inputs and output HDMI to your TV. Picture quality will be noticeably better than composite, though the scaling and deinterlacing in budget adapters is basic.

The better option for anyone who takes picture quality seriously is a purpose-built upscaler like the RetroTINK-5X Pro. It accepts S-Video, handles deinterlacing properly, and outputs a clean HDMI signal with significantly better results than a generic adapter. The price difference is substantial, but so is the output quality.

If your TV does have an S-Video input (older sets, or some monitors), plug in directly. No converter needed.

Where the ElectronNMB Fits

The ElectronNMB (Nintendo Multiout Breakout) connects to the N64's Multi AV Out and provides multiple simultaneous output paths from a single port. It does not convert the signal to HDMI, it passes the analog signal through so you can route it to more than one destination at once.

The practical use case for N64 owners is running a capture card alongside a TV. Without the NMB, you have to choose one destination or run through a converter that may not pass the signal to both. With the NMB, the composite and S-Video signals are available on separate connectors simultaneously. Connect one path to your upscaler or TV, the other to your capture card, and both receive the same signal from the console.

If you only need one output, a standard S-Video cable is all you need and the NMB adds nothing. It earns its place in dual-output setups.

When to Consider an Internal Mod Instead

S-Video is the ceiling for a stock N64. It is a meaningful upgrade over composite and produces a clean, detailed image. But it is still an analog signal from a late-1990s video encoder, and there are limits to how good it can look.

The two internal mod options for the N64 are the N64Digital and the UltraHDMI. Both tap the N64's digital video output before the signal reaches the DAC (digital-to-analog converter) and deliver a native digital HDMI signal directly. The improvement over S-Video is significant, particularly in sharpness and in eliminating the analog noise floor that comes with any analog output chain.

These mods require opening the console, installing hardware on the board, and some degree of technical comfort or a willingness to send the console to an installer. The N64Digital is the more current and commonly installed option. The UltraHDMI is an earlier design that is harder to find now.

For a fuller comparison of N64 upgrade options, including when each one makes sense, see the N64 upgrade options guide. If you are comparing the N64 to other consoles that do support RGB or component natively, composite vs component vs RGB explains what each signal type is and why it matters.

Frequently Asked Questions