I have two of the F40LT UHF 16 channel radios. To program them, I use an old 200 mhz Pentium computer and boot it off of a WIN95 floppy to an A:\, then run the Icom software from its floppy. It is a PIA to do, but it is the only way the software can find the serial port. New computers just won't work even if you get a screen that looks like DOS.
Bob