IIRC (questionable), they used standart V.35-type connectors. But since V.35 is generally a serial interface, and the reader would most likely be parallel, dunno about the pinout... How hard would it be to figure out which lines were input to the card reader (there might be an 'enable' line or something like that)? If it turns out there are no input lines to the reader, then all lines coming out are output, and in the case of the fairly-recent Documation readers, they should be TTL-level signals. Hook up a bank of appropriately-wired LEDs to determine which line are data and which is strobe. Just a thought... -dq