Originals had 4k or 16k.
That was depending on whether you had the A or B motherboard. The A could be expanded to 16k, the B to 64k. I don't think DOS 2 would run in 4k.
We had 30 Original IBM PCs donated to my school. Over the years I helped expand them to 640k. This required a memory card! And correct jumper settings, as we subsequently discovered. All were CGA. Three had printer cards and we had three printers to go along with that. We later had one mouse. That was where I got my first exposure to Microsoft Windows 1.0.
Wade.
