I use an old Pentium 120 MHz to program all my old Motorola stuff. It's an old white Compaq laptop running Win98. I boot it in DOS mode using F8 to run the old RSS. Sometimes you can get by programming with faster computers, but when the program does a lot of resets to the radio during the programming process, it can throw errors when the computer expects the radio to be ready to receive data, when, in fact, it's still resetting and self-checking.