Neither do the computers I'm working with have Ethernet or USB.

16-bit NICs are $10 apiece, and likely free for the asking from almost any
office's dead PC junk heap.

And I have several. Have you ever made a NIC work with DOS?
If so, I'd sure love to learn how you did it.


Besides, there's always the fun of doing it, and that much time
difference should even "pay" for the programming effort.

Seems to me your time would be better spent on things with lasting value.
Linux is free....

Linux may be free, but the aftermath of installing Linux would cost
YEARS of effort to "port" the:
801 FORTRAN programs I currently use
225 Pascal programs I currently use
452 DOS .BAT and Norton's DOS .BTM scripts I currently use.

No, converting to Linux is NOT free, especially at my age!

--
--Myron A. Calhoun.
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
NRA Life Member and Rifle, Pistol, & Home Firearm Safety Certified Instructor
Certified Instructor for the Kansas Concealed-Carry Handgun license