[wbill]

still use a number of stand-alone Windows 95 computers

Win95 (and 98) allow direct hardware calls to be made.

I worked for a place where some of their automation was still running under DOS 5.0. Worked fine. :-)

[TexasRepublic]

I just retired a Compaq Prolinea 386sx running DOS 3.3 that was controlling some old lab equipment.