Perhaps the input images they used were also low-res? If they had used higher resolution photos it would have taken much more computing time to run them through the neural network for hundreds of iterations. I guess the same neural networks could also enhance the resolution of the images by being fed a scaled-up version and outputting it with more (imagined) detail.

In my experience 200% font scaling has worked fine since Windows XP. There are very few apps which don't handle it right - although a few things such as the command prompt remain unscaled. It probably helps to turn off the Aero crap though.

I use a couple of 24" 4k monitors. Just set 200% font scaling and you have things appearing the same size by default as they would on a 1920x1080 monitor with normal font scaling. But they look much better rendered, and if you want you can zoom out to smaller text sizes while remaining legible.

Sadly this snippet does not work in recent perl versions (I tried 5.18). 'each window' for example now needs to be 'each %window' since hashes must always have the % prefix. (In ancient perl versions the % was added implicitly if not given)

Can't you just copy in the minesweeper.exe file from an older Windows version and run it? Who knows, if you do an upgrade from 7 to 10 it most likely will be still there.

Acorn's PC emulator emulated an 8086 (not 80186). There are a couple of extra instructions added in the later 80186. Not much software uses them but apparently the game Star Trek 25th Anniversary did. Dave Lawrence's FasterPC emulator provided a virtual 80186 (though the CPU emulation was still just as slow, the video support was faster and PC speaker emulation much better, so it could play many DOS games that used 320x200 res in 256 colours. Like Civilization...)

The PC-XT keyboard has excellent keyswitches but a lousy layout. The PC-AT keyboard is much better; the 122-key Model F terminal keyboard is the most modern layout you can get with capacitive buckling spring.

I've done that - put black M13 caps on an F122 - but what do you do about the Enter key on the numeric keypad? The F has a stabilizer wire which the M lacks, so if you put the black key on as-is it sits limply and doesn't click properly. Similarly, the spacebar stabilizer wire is different - how do you get the black spacebar to attach properly? I see that whoever did that mod changed the F to ANSI layout. I kept mine as ISO but that meant I had to stay with a few non-black keys.

Older Model M keyboards have a detachable cable. You can buy a replacement cable with USB adaptor built in, effectively turning it into a USB keyboard. For those with fixed cable, yes, the 'blue cube' adaptor works, or there are ones sold based on "Soarer's converter".

So... what is it you need that Mono doesn't do?

That's true but I don't think the required CPU power scales linearly with the display size.

The IBM T220 was launched in 2001 and has a resolution of 3840x2400, slightly more than 4k. Even back then, processing power wasn't really an issue, but getting enough display bandwidth was (four separate DVI cables were needed to get the full refresh rate of 41Hz).

Others have mentioned Topre keyboards; you might also like to look at Mattias quiet keyboards. But really if you are happy with the Logitech G15 then there is no need to change away from rubber domes - keyfeel is entirely a matter of personal preference.

Panasonic is about the only major PC maker which makes Apple kit look cheap. You pay a big premium for that extra ruggedness.