I have old netbook that's still running Win XP. It's a cracked OS so I cant upgrade it. I never use it and it's just sitting on a shelf but it still works without any problems. I guess if I ever need it in a pinch, I have it for that. Otherwise I dont have much use for it now.

 

Windows 8.1 on my 2009 custom built PC.

 

TI-99a

 

My primary desktop was originally constructed in 2000 with a 667mhz processor. I have since upgraded it continuously. It now has 3 monitors (2-2k 1-4K), an 8-core i7 processor and a GeForce 1080 video card.



I suppose my oldest untouched computer is the Samsung Captivate that runs at https://AdamOutler.com. This device has been in operation, continuously.

 

A week ago I replaced my business Windows XP machine from 2002. I had no desire to keep running it but had about $13k worth of licensed software that I couldn't migrate. Computer is still running, I'm only using it if I need that software though.

 

I have a few Win 95/98 PCs laying around that will boot no problem.

My oldest currently running PC is a 05(ish) Dell E510, I've only upgraded the OS and old 250gb hdd to a 120ssd and added a 500gb secondary drive.

This is soon to be replaced with a Optiplex 780 I got from work for $5

 

I have a 98SE machine I use to play Falcon 4.0, Jane's Longbow and WW2 Fighters.