Hope everyone is doing well. since the covid, I have been trying to get a repeater I have to program. I have been thru a long list of things, I have a Motorola P1821AX. I have a older dell which I have already installed FREEDOS on it, and when I try to read the radio RSS Version R06.00.05 03-JUN-93 . since this is a different type of radio I was told to use the connector thru the programming port on the front. I had purchased the cable on ebay :Motorola Spectra / Astro Spectra Digital Mobile Radio 15-pin Programming Cable | eBay . after getting everything up and ready when I try to program the radio, I see the display change to program but then I get an error. Serial Bus Failure, Bus timeout error. I have tried different settings on the loading of dos, but it doesn't seem to change anything. I have spent about 2 months searching for answers on what could be wrong. but I'm stuck, so I'm reaching out to everyone and thus hope that someone could tell me what they think is wrong. I have used this computer to program my vehicle Spectra and did not have any issues with the computer itself. however, this is the first time I'm using the builtin RIB cable. I have followed everything they say about the cable and I'm lost...., anyone, have any experience of programming this particular repeater??