I use an RS-232 port for an IrDA receiver (HTPC remote control). I also use it to mess with the ECU EEPROM in my horseless carriage via the OBD-II port. Certain software is not compatible with USB and USB is inherently less capable of strict timing in any case.
Worth noting, USB likewise fails to achieve the same sampling rate as PS/2 meeces and fails to provide for adjustment of controller dead zone as gameport does. USB does seem to be adequate for printers however.
The latest thing I did to the car, only recently, is enable an undisclosed feature to automagically open or close all the windows from the key fob. Handy for hot weather -especially to vent after being parked in the sun, before even reaching the car (the range is substantial and in any case the door lock is blanked).
Worth noting, USB likewise fails to achieve the same sampling rate as PS/2 meeces and fails to provide for adjustment of controller dead zone as gameport does. USB does seem to be adequate for printers however.
The latest thing I did to the car, only recently, is enable an undisclosed feature to automagically open or close all the windows from the key fob. Handy for hot weather -especially to vent after being parked in the sun, before even reaching the car (the range is substantial and in any case the door lock is blanked).