I still have the Toshiba T2100 that I wrote statistical software on; I was a QC on seismic survey boats & got fed up with doing it all offline; started with a Compaq sewing machine portable (which my ex-wife still has) but then bought the top-of-the-line T2100 in 1990 as it weighed less; it needs a CMOS battery & should crank up DOS3.3 just fine. Made a lot of money on that machine, taught myself C to do it.