Here's a trick I learned today. There is a command line switch for Java (well...rxtx lib) that will only present the COM port(s) you tell it to present to RomRaider. This is especially useful if you have a bunch of com ports and you don't feel like digging through them all every time you launch RomRaider, or if you are a linux user like me, and have your tactrix cable symlinked with a UDEV rule so it appears first on the list and automagically connects.
Here's the switch I use for linux (with my tactrix cable having a symlink to /dev/ECU with a UDEV rule...good idea if you have more than one USB serial device...I'll post the rule next time I download stuff from my car...com ports are listed alphabetically, so /dev/ECU appears before /dev/ttyS0) that makes the tactrix cable appear first on the list, and COM1 still available for my LC-1, but it skips my GPS receiver and anything else I don't want that shows up under /dev/ttyX:
-Dgnu.io.rxtx.SerialPorts=/dev/ECU:/dev/ttyS0
This *may* work for windows. It is untested, but for instance, if you know your tactrix cable is at com 5, you have an LC-1 on com1, but you have a modem on com 4 and unused com port 2 you don't want listed in the logger as possible selections:
-Dgnu.io.rxtx.SerialPorts=COM1;COM5
I'm pretty sure windows needs semi colons, not colons, for groupings of command line arguments. If you only need one serial device, leave the semi-colon off!
Now for Mac...I actually have never had any serial device hooked up to my macbook pro, but if I did, I would imagine it would look like this:
java -Dgnu.io.rxtx.SerialPorts=/dev/cu.*something here*:/dev/cu.*something else here*
More information:
http://rxtx.qbang.org/wiki/index.php/Installation