MITS 1440 Calculator

Does anyone have a MITS 1440 Calculator? I am looking for someone who either has a non-working unit, or one that needs some sort of attention, or someone who would be trusting enough to loan me and a friend their working unit to carefully swap the ROM chips and see which one is bad. I think the risk of damaging a good chip is low, but paranoid attention will be made to avoid accidents. I have been told that the input chip is OK, and the output chip is OK. The control chip seems OK. Most likely the program ROM chip is bad, but it could possibly be the registers or ALU. More likely the ALU than the registers chip.If anyone is interested in this project, feel free to drop me a line. See July 1973 Radio Electronics for more info. Bill D