Hello, I have a GPIB option card (PM9626) from a PM6680 and I would like to use it in a PM6685. Looking at the service manuals, the only difference between the two GPIB cards for the two counters is the FW PROM, so I'm looking for a PM6685 GPIB PROM image or anybody with a PM6685 that could help with this. Thanks!, Claudio