I also have a Tulip 286-12.5 running Windows 1.03, a Compaq Portable II (computerised hernia generator) running Windows 2.03, a "De Luxe" 1989 Compaq Deskpro 386-16 running Windows 3.11 with Sparta system override ( improved Windows by removing MS crap and presenting a MAC OS desktop. Waste bin is a an animated Goat!!), a home built 486 DX 128 running Windows 95 and another home built 486 running Windows 3.51 NT.
That's the unreliable MS contaminated computers.
The other reliable ones that never give no hastles or bother are an old LC II and a Quadra 660 (both MACs).
I have to keep so many computers due to the sheer expense of engineering software and some of the tools electronics engineers have to use (embedded compilers, ECAD, circuit emulators, spectrum analysers, PIC / EPROM programmers, gizmoes, etc.) which every upgrade of Windows will create compatibilty issues with.
As some of the oriuginal companies are no longer around, no longer support or would rather you spend the price of a small motorcycle on buying the new "works with the latest version of Windows" (we hope with fingers crossed), it pays to hang onto antique computers.
And then there are the specialist ISA / Vesabus cards. One I have (actually I have 4 of them) cost me £992 a piece and is for the sole purpose of raising IDE hard discs from the dead and data salvage. It allows the reprogramming of the onboard E2PROM on the HD when it is fitted to a same make different capacity HD.
There are also a few other home built and aquired engineering related ISA and Vesa cards here that won't fit in the modern machines.
Another problem is the lack of RS 232 / 485 and parallel ports on modern PCs which 95% of industrial machinery, such as pick and place PCB assembling machines, car assembly robots, etc. hook up to.
This is all a headache for business and industry as PCs are marketed towards gamers and office work whilst ignoring industrial use.
If you want to see old 088, 086, 186, 286, 386 and 486 PCs hard at work running on DOS go and visit an average small to medium size business with an automated assembly line.
Was Windows 8 welconed by industry with open arms.... what do you reckon??