+ 0 Votes I know of NO way mjd420nova May 28, 2013 at 3:03am PST I have an old IBM AT running a home automation/energy monitor system. It has the 5.25. dual DS/DD and a 5.25 1.2 MB floppy. This was the top media density until IBM started the PS2 line and the 3.5 diskette 1.44 MB media. and was accompanied with the new 80386/387 chipsets. Dos was up to 4.01 until the inclusion of the coprocessor on the same substrate as the processor and needed DOS 5.0.