Hi All
all of the above USB TO SERIAL and rs232 pc cards work very well but please ensure your money isnt wasted on cheap serial to usb Cable as nearly all the cheap ones dont work
Part of the Problem with your device manager can be down to Toshiba and Hewllet Packard where the USB chipset had issues in reconizing some hardware including AMBrc decoders and using a serial to usb cable will resolve this issue also would recomend using the network Cable supplield with the AMBrc if using the AMBrc3
from a software point of view BBK ECCO is free and usb compatable and it also has a link to AMBUSB on its website
http://www.bbksoftware.com/
Hope this helps
Glyn