I see people here making the switch to RetroArch for this new version of HyperSpin, that's good as I feel RetroArch is one of the best all in one ways to play these retro games. I see people having trouble on RetroArch with the Sega Saturn and Nintendo 64 cores, I'll try to help out the best I can. Mind you I'm still on 8.2.3 on my Shield and will not update it to 9 until I know for sure HyperSpin works again at the least but first thing's first, for Sega Saturn and Nintendo 64 use the Yaba Sanshiro and Mupen64Plus-Next GLES3 cores, the Parallel N64 core use to be good but is now outdated so it's not recommended. For the other Sega Saturn cores Yabuse does work kind of but it's also really old and outdated and the best Saturn core Beetle Saturn is the most accurate but the Shield simply isn't beefy enough to handle it so it runs slow as hell ( I wish it worked). Next, those two cores (Yaba and Mupen) only work fast on the Shield in GL mode so make sure your driver in the settings options is set to "gl" and not vulkan, use vulkan for all other systems though.
Next I'll point out that the Yaba Sanshiro core has not been updated in almost 2 years or more, it's still stuck on the old 3.4.2 version and the mod that runs that core refuses to update it for reasons he stated on the libretro forums you can find if you do a search there.
For N64 after you load up a game I recommend you go into the core options, there you'll see a few settings, one named RDP Plugin and RSP Plugin. Leave RDP Plugin on the GlideN64 settings and leave RSP Plugin on the HLE setting. Most people would recommend changing both of those settings to Parallel which is suppose to give you better speed but for some reason on the Shield it does the exact opposite and slows games down so I don't use it and it has not been addressed yet.
Anyway go into the GlideN64 settings and change all these settings I'm about to list below to give you a better and closer to accurate gaming experience:
4:3 Resolution - 320x240
Bilinear filtering mode - 3point
Dithering - On
MSAA level - 8
Copy auxiliary buffers to RDRAM - On
Background Mode - Stripped
Continuous texrect coords - Force
Native res. 2D texrects - Optimized
Less accurate blending mode - Off
GPU shader depth write - On
Anything not mentioned you can leave as is.
For Yaba Sanshiro I recommend using chd files over the bin/cue format, for some reason when I used bin/cue I had problems with bgm tracks not looping properly and playing bgm from whole different parts of the game instead of the intended stage bgm, that all stopped when I switched over to the chd format.
If both the Yaba and Mupen cores crash for you before even loading up try going into into your folder program and the RetroArch/Config and then go into both the Mupen or Yaba folder and then open up the cfg file and look and type in "video_driver = "gl" then save it, that way way even if your video driver setting is set to vulkan those two cores will always start in gl automatically for you. Also make sure you're using the latest version of RetroArch and not some old outdated version, a lot of problems happen because a user is using an old version of RetroArch.
Dolphin stopped working on Android RetroArch for almost 3 years now as well so your only choice is the stand alone emulator for that. I'm sure some of you know PS2 now works on the Shield and I posted the parameters needed in the ps2 settings thread to get that up and running on here as well.
Finally this one is a little off topic but for those now switching to RetroArch and would like to apply a filter/shader I made some nice looking shader presets you can use to get that old school crt look. I made a shader pack that only works with the vulkan driver and then I put together a gl shader preset you can also use specifically with the Yaba and Mupen cores in gl mode that you can check out here:
https://forums.libretro.com/t/please-show-off-what-crt-shaders-can-do/19193/4855?u=sonkun
and here:
https://forums.libretro.com/t/a-new-little-shader-i-did-glsl/36028/114?u=sonkun
Another benefit to switching over to RetroArch is you can use overlay bezels to fill in the black spaces on the side of the screen to get your games looking like this:
https://ibb.co/C7Ry3x5
https://ibb.co/9TbRDB1
Any other questions and I'll try to help out the best I can. I can't wait until everything is sorted out and we all can use HyperSpin again new and improved again.