In case it's helpful to anyone, MiSTer is a project[0] that recreates classic computers and video game consoles on hardware.

What do I mean by hardware?

Rather than emulating the device in software, which can cause various issues (especially related to timing), by mapping the actual device logic to a field programmable gate array (FPGA), you can achieve an "exact" replica of the hardware.

It's a super cool project, and I highly recommend checking it out if you have an interest in old machines (Apple II, Commodore 64, etc.).

[0]https://mister-devel.github.io/MkDocs_MiSTer/

Damn there is a whole ecosystem around that, e.g. https://ultimatemister.com to buy it all built, very neat.