You need to answer this question first - is the programmer a USB, Serial, or Parallel programmer?
If it is USB, the programmer is at /dev/ttyUSB#, where # is the USB port (starts at 0).
If it is Serial, then it is /dev/ttyS# (once again, starts at 0)
Parallel - not too sure. Never had a computer with a parallel port in the past.... bajlilion years. I'm sure it's something like ttyP#.