My basic premise was to try and get the best signal I could out of the systems, and have things set to just work when turned on. Originally I thought I would do everything on the one main TV in the bar, but I was inspired by the guys at My Life in Gaming that I didn't need everything on one system, particularly because I couldn't come up with a physical layout to fit everything. With that idea, I decided to break it into two parts, with the older retro systems in my office.
Additionally, I decided to focus on two standards for the video signals to try and make things easier. For modern systems, the familiar HDMI cable would do. For retro systems, I would focus on RGB, which is supported by many, but not all, of the older systems. For those that didn't support it, I would get the systems modified to support it.
With that, I couldn't decide about doing a CRT or HD, and so decided to do both. My idea there is that the CRT is the "original" image, the way the system was designed. That's a full RGB video signal, but thus also standard def. Next to it is the HD TV, showing the upscaled image -- converting the SD signal into a HD one. The SD signal is the way the consoles were designed, so if you are a purist that's the signal of choice, as well as being a reference for the HD one next to it when I compare. The SD signal has "scan lines", which are an SD artifact. The HD signal does not.
The CRT is a Sony PVM-20M2U. It has RGB inputs. I've connected that to a gscartsw_lite, via a SCART to RGB cable. (Running off that is the audio signal which goes to the speakers). Each console in the rack is hooked up to that switcher.
For the HD signal, the gscartsw uses one of it's two outputs, to send a signal via SCART cable to the Open Source Scan Converter. The OSSC does the work of taking that RGB signal and making a nice HD signal out of it.
In the retro section, I have a RGB modded NES, a stock SNES (as it supports RGB), a RGB modded Nintendo 64, a Nintendo Wii (connected to the gscartsw via a GARO component to SCART converter), and a PS2. Below that is an original Xbox (again, supports RGB) and a Sega Genesis (RGB!), and a RGB modded Atari 2600. All run to the gscartsw_lite.
Moving from my office to the bar, there is the second setup. This focuses on the HD systems.
The TV is an LG, which has connected to it's HDMI port a DVDO Duo, which handles the switching of HD systems. Connected are an Xbox 360, an Xbox One, the original PS3 (which handles PS2 and PS1 backwards compatibility), and a PS4. The PS3, PS4 as well as a Nintendo Switch are all connected to a single HDMI port with another, 3 port auto switcher, because there just aren't enough ports.
Also connected are a Retron5 (doing HD for NES, SNES, Genesis, Mega Drive, Famicom, Super Famicom, Gameboy, Gameboy Color, GameBoy Advance), a RetroPi, and for good measure, an Apple TV. Finally, going into the two analog ports and upscaled are a Nintendo GameCube and a Nintendo 64. (I have on order the parts to upgrade that N64 to full HDMI).
Back in my office, I have a shelf dedicated to the portable systems.
That's a Nintendo DS, Game Boy Advance (with the upgraded display), a PSP, a GameBoy Color, and a original Game Boy (also with upgraded display).
Just below that and to the left, I have the NES/SNES/N64 collection of games.
I've gotten wireless controllers for the NES and SNES which also have charging stations. The Atari, Genesis, N64, and original Xbox controllers are in bins below all the retro systems. The PS2 controllers are wireless now as well. In the main room are stations for XB360, Wii, Wii U, XB1, PS3 and PS4 controllers all under the MAME cabinet, which Sharon has very deftly hidden.
Essentially, everything is ready to turn on and play. A labor of love to get everything working and setup. I have most of the "core" games for systems, and own SD card carts for everything that makes one, so you can load ROMs if needed. I own most of the games from my childhood, and am working on completing collections of "every" Castlevania, Star Wars, and Star Trek game, and am missing just a handful of Street Fighter games. (For those interested, my game list is here, although that's only the physical games. Everything for Switch I've bought as digital download, and have a number now for XB360, XB1, PS3 and PS4 that are digital downloads too)
The point is to play the games, of course. We've been hosting "retro gaming days" periodically, and have the systems on and fired up for play. Let me know if you want to try something out -- or I'm missing a game you want to play.