Interesting thread...
My oldest computer in regular use is a 1996 Micron Millennia Pro2, currently configured with a single 200 MHz Pentium Pro CPU with 256K L2 cache and 256MB of ECC EDO RAM. Motherboard can handle a second CPU; I've got another CPU and fan but not the required voltage regulator. I also have the RAM to boost it to 512MB, but it takes forever to get through POST with it installed.
It also has a WiFi card, USB 2.0 card, nVidia GeForce 4 MX video, and a 256GB 7200 RPM hard drive.
It currently runs Windows XP SP3, and serves as:
- A print server for my parallel-port dot-matrix invoice printer
- A scanning station with an old parallel-port scanner
- Programming station for RS-232-equipped radio transceivers
- Workstation for legacy Windows applications that won't run on Windows 10
The most modern Linux I've been able to run on it is Lubuntu 14.04. Several newer distros will report a successful install, then black-screen/hang on startup. Swapping out the nVidia card for one equipped with an S3, Trident or Permedia GPU doesn't help.
Also have a 1998-vintage Micron TransPort 2 AGP laptop with a 300 MHz Pentium II-M CPU, 384MB RAM, PCMCIA WiFi and Gigabit Ethernet cards, and a 32GB SSD. It won't run XP, but runs Windows 2000 Professional and will run the current version of debian-based Q4OS Linux. Incredibly, the OEM battery is still good and will power it for about two hours.
My first microcomputer was a Commodore VIC-20. I still have one, with a Datassette drive and 16KB RAM card. One of these days, I'll find a diskette drive for it and put it to work as a weather forecaster.