Well, you just have to not use the internet. Just like in the olden times…
I also have an old XP laptop stored away. Its only purpose: Talk to my old photo negative scanner whose software won’t run on more recent OS’s. Only communication with the outside world is by USB memory stick.
I still have my old Lenovo X61T which is nearly as old. With maxed out RAM (4GB) and an SSD it is actually still quite usable (running Linux). I love its great keyboard, that’s the reason I kept it. At some time my kids discovered that it is still able to run Minetest at reduced settings and so it now is part of the occasional LAN-Party when friends are over. Opens my heart to see the old buddy right in the middle of action being used by a bunch of kids that are only slightly over half its age!
Oh, a D6x0. 620 was my first ever company laptop! I loved it. Easily swappable cd-rom, you could change it to an additional 4cell battery. Combined with a 9 cell one it lasted basically the whole work day.
Though if you wanted to part ways with it, you can pick up an FTDI USB serial adapter for cheap. Though if it has a parallel port, hold on it it. Parallel ports USB adapters are just printer adapters and don’t work for general parallel port use.
USB serial adapters sometimes have compatibility issues. Hardware serial ports have interrupts, while USB serial ports can only be polled at a limited rate.
There are serial and parallel PCIe cards available that work much better than the USB adapters. Some modern desktop motherboards still have a serial port, but it’s usually a pin header that will need an adapter to connect to. There is also a nearly pocket sized laptop with a serial port and more connectors than many full size laptops have.
The parallel port used to be used for connecting all kinds of homemade devices like logic analyzers, microcontroller programmers, frame grabbers, or just used for GPIO for reading switches and controlling relays. It was a lot easier to access directly from DOS than it is from Linux or newer versions of windows though.
Of course you could just connect a printer to it. I’ve got a thermal receipt printer that I’ve been meaning to write software for eventually. It will print out whatever I cat to /dev/lp0, but I can’t easily do any formatting or control the cutter that way.
My B450 motherboard is pretty long in the tooth, but still firmly a "modern" component. I just added a Serial port via its built in header to use an old "Spaceball" for CAD. It only works in a few Windows apps, which is a shame because it's completely a software issue and it works PERFECTLY in the apps that still support it. Linux as well, though I've only tried that via a USB-Serial adapter on my laptop.
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