I found this UPS for 4 bucks at a Habitat for Humanity restore, and I figured "what the hey, why not try it out." I assume its very old because it has the gross matte whiteish color that you see on electronics from the 90s and early 2000s (If this works than I am gonna get handy with the spray paints). The test beeper still works, but it is giving me an error code. I found out its just for a dead battery, so I bought one for this model off ye' old amazon. Also on this model it has one of those RS-232 data connectors (It looks like a VGA/ D-SUB port with one less row of pins and is an old semi-equivalent for USB, but kinda not) I have a RS-232 to USB adapter and tried using it. My computer sees the device but can't communicate with it. I am wondering if I need to go driver hunting, or I need to count my loss of 4 dollars and take a trip to my recycling center. Is RS-232 supposed to be PnP. I have no idea because of the age of this form of communication. Also just any other general info you have about this UPS would be awesome. Thanks for your help.