I think the reason you cite for the mismatch is the strongest one. If you're into collecting 80's BMWs you can still easily drive with a club including newer cars every weekend on the same roads, use the same petrol, easily get plugs, belts other parts etc. But an 80's PC is much more "stuck in time" and you need to be quite knowledgeable to maintain and enjoy in the same way.
I saved my work as a text file on a USB stick, which was no problem bringing over to my modern Mac.
Back in 2000 my first laptop had a serial port and i bought a Wacom serial based tablet for it. A couple of years later that was gone and i had to buy a USB Wacom (that still works with win10 on modern machines!!). So for some other HW project i had to find a USB-Serial converter, so the question will be, are we really supporting the same old standards if we're forced to chase dongles?
Mac OS still ships with BinHex (https://en.m.wikipedia.org/wiki/BinHex), I think, so for Macs, that might already be the simplest way to exchange data between an early Mac and a modern machine (even if you have a floppy drive, does it read Mac disks?)
Edit: maybe my memory is of, and it was direct dial-up to another machine, not across the internet. NCSA Telnet (https://en.wikipedia.org/wiki/NCSA_Telnet) supported TCP/IP before the OS did (yes, that was possible. I don’t know whether you still could do that on a modern system), though, so who knows?
In general you can. If the OS lets you open raw sockets, you can implement TCP and all yourself in userspace. Although in those days, I'm guessing it was actually implementing the entire AT modem stack too, and just driving the modem directly via a serial port.
I'm sure you could. In 1985-ish.
How much of the required hardware still exists? How much of the required software can you find? Is that software (or another version of it) also compatible with your modern computer? etc.
Technically, sure, you can use your retro car every day. But most people don't, probably because it would be less practical and also lower the value of the car over time.
Not so much with old computers - NOBODY, not even the poor in the USA, are trying to make do with a 8086 as a daily computer. Phones and better computers are simply too cheap and available.
I remember from my trips to America that even some of the well maintained cars there wouldn't have been legal in the UK. For example some didn't have orange indicators, instead using the red break lights as an indicator.
A very few states have a more stringent "inspection" but it mainly checks that the car has working lights and brakes - nothing like an actual costly check.
The USA doesn't even mandate daytime running lights as far as I know.
The rules are designed to apply to vehicles being preserved, and are a help to hobbyists who can afford to own two or more cars. They seem to be designed - for better or worse - to exclude people who happen to rely on an older car as their only vehicle.
A new $25k sedan here (Arizona) costs like $350 or so per year to license, but a 40-year-old one worth $700 scrap value costs like $30.
https://en.wikipedia.org/wiki/Vehicle_inspection_in_the_Unit...
For example, I’m from Illinois, and you only have to have an emissions test in the Chicago and East St. Louis regions. I grew up near Peoria, where you can seemingly drive whatever disgusting uranium-and-coal-fired jalopy you want.
I guess the biggest difference is that you can still use a collector car to go for a drive today, but on the other hand there is not much practical use to get from a collector computer. Sure, you can play old games, but most of the task you'd do with a modern computer can't be done with an old one (unlike cars).