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I recently found out that archive.com, besides being generally amazing, has exhaustive collections of content. This includes files for pretty much every videogame ever released, up to Wii/PS3 era and some beyond.
https://archive.org/details/no-intro_romsets - This contains complete romsets for every cartridge or floppy based console out there, from Atari 2600 to N64.
https://archive.org/details/@atrac17 - Here's everything CD based from Sega, and some Sony.
Obviously these things are being updated, but the missing content is limited to stuff like 'Flemish Beta release'. If that sounds appealing to you, then we share an illness. There are also curated collections out there (eg Champions collection) if you don't want to sift through all that toss.
I found out that emulation has evolved a bit since my day, and now you have the option of consolidating emulators within a frontend, like Retroarch - https://www.retroarch.com/index.php
There are a bevy of handheld or plugin consoles that can emulate some fairly modern systems. There's also Retropie and stuff like that, so you can basically create your own emulation platforms. It's mental what's gone on since I last looked in.
On the obsessive side, there are numerous groups (ReDump, No Intro, 1G1R, TOSEC) who create their own 'dat' files, which contain all expected files and can be used to verify a checksum to validate the rom file. There's rom management software, like the picture attached - I've recently found that it's easy to create your own dat files using clrmamepro (rom management focused on MAME, the arcade emulator), so I'm now sorting my collections into a few groups so I can host the core ones on an ftp for when my HDD inevitably dies.
Finally, if you duckduckgo (no wonder they aren't taking off, how the fuck do you shorthand that?) 'games over girls' you'll find a slightly disturbing set of photos of women dressed up as game characters and feigning unconsciousness in awkward poses.