The simplest way I know to find the mount point of an unknown device is to look in /dev/sd* before and after plugging in the device, assuming it turns up as a mass storage device that's where most things appear in my experience. If the list of files there is the same before and after, try looking for some of the paths trashy mentioned like /dev/floppy, or since debian in my experience runs an automounter, look in /media, but you'll need a disc inserted to see that.
Edit: On the pyra, yes the d-pad is mapped to the keyboard arrow keys. I don't know when wsad became a standard control method in DOS games however, as far as I recall it was like that by the time of the original Doom. The game buttons are also keyboard keys, that of pgup/dn, home, end, insert and delete. Only the nubs appear as analogue devices, so may be mapped as joysticks or something, I'm not sure.