Does anyone know a source of circuit diagrams for the HP9100A or HP9100B? (A friend has one and is seeking to understand aspects of it). Known of are: *Tony Duell's hand drawn one 9100B - many page of diagrams. * and 12 pages relating https://ia802508.us.archive.org/1/items/bitsavers_ hp91009100_28364269/9100B_Schematic.pdf Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .