able to use my Palm IIIc serial cable to the newer laptops via a USB plug…

no problems

Did not work, crashed my windows 10 pc, has extra cable the plugs in the side and goes to one of your usb 2.0 ports, not shown in advertisement.

Works great, and it is reliable.
TRENDnet USB to Serial Converter, USB 1.1 to RS-232 Male (9-pin) DB9 Serial Cable, Prolific Chipset, Windows 10/8.1/8/7, Mac OS X 10.6 and Above, 26 inch length, TU-S9