How can I play a SNES through a VGA monitor?

There are a variety of computer cards called TV Tuner Cards, many of which include TV Capture functionality - older ones often have the Cable or Composite-In you'll require (this is how I played Majora's Mask the first time).

TV Tuner/Capture Card (Red/White audio leads are meant to be combined and go through the 3.5mm jack).

There are also apparently USB versions now. First I've heard of these.

Both cards and USB sticks can be found at your favorite online stores (at least one was selling a USB Adapter for $8!). You may be able to find a used card at a used goods store, too.

Unfortunately going from Composite to VGA is not a simple process. VGA has 3 channels (RGB), while composite has only one channel. To go from composite to VGA, you have to do this:

Analog (Composite) => Digital => Digit processor to split the channels => Analog (VGA)

Although cheap converters seem to be available (Amazon search for "composite to VGA"), you may need to look at the frame rates and response time for playing video games. It will mess up your gaming if you jump 2 seconds after pressing a button.

There's no cheap way of connecting an SNES to a VGA monitor. The SNES can output Composite video (the yellow cable, poor quality), S-Video (round cable with four pins, sharp image with a slight amount of color bleeding) and 15khz RGB (perfect quality). Unfortunately the RGB output can't be fed directly to a VGA monitor - these generally have a minimum resolution of 640x480 while the SNES outputs 256x240.

To get RGB output you need a JP21 cable (also referred to as Japanese SCART, because it's physically identical to European SCART cables which have 21 pins, but the wires are hooked up differently).

If you want to use a real SNES the options are:

1. Acquire a CRT TV. It shouldn't be hard to find one, e.g. on craigslist. Most people would rather have a flatscreen these days so you might even get one for free. This is your only super cheap option.

   • Pros: Cheap, no lag, 100% accuracy.
   • Cons: Poor video quality, especially since small TVs are unlikely to have S-Video.

2. Acquire a line-doubler/video processor. The best of these for VGA is the XRGB-3. This'll accept the RGB output of the SNES and double the resolution to 640x480 with practically 0 lag and no blurring, while outputting VGA. Alternatively the XRGB-Framemeister will scale up to 1080p (again without any blurring) while outputting HDMI with only a small amount of lag. See this site for more information and alternative upscalers/processors.

   • Pros: Pixel-perfect video, zero or very low lag, allows you to use regular computer monitors. This is the best option for hardcore enthusiasts with a lot of money.
   • Cons: The XRGBs are very pricy, upwards of $300.

3. Acquire a PVM monitor. From what I understand these are old high-end monitors that weren't available to the average consumer. These will accept the SNES's RGB signal directly but you'll probably need a JP21 to BNC adapter.

   • Pros: Pixel-perfect video, no lag.
   • Cons: Hard to find, probably won't be cheap, not useful for anything else.

4. Buy a cheap composite/S-video to VGA converter.

   • Pros: It'll let you connect to a VGA monitor?
   • Cons: Video quality won't be any better than with a CRT TV, possible lag, could probably acquire a CRT TV for the same amount of money.

If you want to use an emulator your options are:

1. Use higan emulator.

   • Pros: Unlike other emulators, has no known bugs. This is as accurate as you can get without using a real SNES.
   • Cons: Requires much faster processor than other emulators.

2. Use a fast emulator like snes9x on your computer.

   • Pros: Low hardware requirements.
   • Cons: Less popular games will have bugs.

3. Use an emulator-in-a-box like the Retron 5.

   • Pros: Kind of like having an SNES with HDMI output.
   • Cons: Still an emulator, less popular games will have bugs.

You can dump your cartridges and use real SNES controllers with a retrode but it's pricy ($80).

Absolutely doable. Is it viable? Different question entirely.

A fairly cheap purchase of S-Video to VGA adapter will do what want, however every other option mentioned thus far is a better way of doing it.

In my opinion there are 2 best ways to play those games:

1. Connect real SNES to real CRT TV (or a broadcast monitor, or an old 15kHz-capable computer monitor). Because this is the only way to get zero lag and full authenticity. Also, light gun games and old 3D glasses work. Connection options may vary. Here, in Europe, almost any TV has RGB SCART input that also supports S-Video and composite. In my opinion, even composite is enough for SNES games, just avoid the RF input. You can easily plug red and white audio line outputs into a separate amplifier if your TV only has mono audio. When moving to RGB through S-Video the image gets sharper and the colors become less muddy but, in my opinion, it doesn't always make the experience better. I'll probably get more downvotes, but this is true. The artists who made the art of those games never expected the graphics to look the way it looks with that $300 Framemeister. The ability to see every pixel of a dither pattern is hardly an improvement.
2. Using an emulator on your PC, tablet or game console. This approach will typically yield smaller lag and better picture quality than connecting old console to a modern HDTV or an upscaler. Also, many useful features, such as gameplay recording and playback, savestates, CRT shaders etc. There are USB adapters for any old gamepad you can find.

About other options:

Most HDTVs or cheap converters are unable to process the video produced by old consoles correctly. It is 240p 60FPS instead of expected 480i 30FPS. In addition to lag, there will be various problems with moving or flashing parts of the picture that may be quite annoying. This is why specialized video upscalers exist. For CRT TVs there's virtually no difference between 480i and 240p, except more pronounced scanlines in 240p mode.

Connecting real console to a modern TV or to PC monitor via upscaler is just an expensive method to obtain emulator-quality image in the best case, and a lot of lags and processing artifacts in the worst case. Don't expect random upcaler to work, some of the more expensive video processors are totally unsuitable for gaming. This is the primary source for the information on the subject: retrogaming.hazard-city.de (due to downvotes I'm unable to post more links)

I dislike Retron and advise against using it. It is just an emulator running on small Android-based computer put into a fancy case equipped with cartridge readers. Only difference between it and other dirt-cheap android devices is that it has cartridge dumper circuitry and prevents you from running your own ROMs. It has quite a few issues and the SNES emulator, in particular, is laggy. Source: http://retrorgb.com/retron5review.html

Also this: http://www.libretro.com/index.php/hyperkins-retron5-continuing-licensing-problems/ They are selling FOSS emulators for money, against the license.

It gives you nothing but emulation anyway. And it's not the best kind of emulation you can get. There are much better emulators available for free.