A low-cost, IBM PC-based, advanced programmer to give you a more convenient (and less cryptic) method of programming decoders. Includes Windows software (at no extra charge), requires Windows or DOS with an available COM port, plus a 15V DC power supply and programming track wired to the PR1 with the cable provided. With this set up, you can read and write all the decoder CVs and their vales right on the computer screen. The OR-1's DS54 option also let you program DS54 Stationary Decoders. general access to all RP-9.2.2. CVs without sophisticated capabilities is also provided. Because the PR1 does not connect to LocoNet, you can program decoders without having to shut down the layout.