This weekend I acquired an HP-97 calculator dating from 1967! It includes a thermal printer and mag card reader. When I got it home I found that it rattled, so I dismantled it and found two large burnt out resistors on the keyboard PCB. The rattle was caused by pieces of these resistors in the case. Does anyone have docs sufficient to determine the replacement parts for these resistors? What is the power input requirements for the HP-97? Regards, Hans B Pufal Comprehensive Computer Catalogue <http://www.digiweb.com/~hansp/ccc/> <mailto:hansp@digiweb.com>