cctalk-request at classiccmp.org wrote: There are likely to be date codes on the red pulse transformers, that might be of some use. I don't think Lockheed made computers for general purpose use, so I might think this was for some aerospace application. The card edge connectors sort of go against that, however, they tended to use a minimum of connectors like that due to vibration. I have a Honeywell airborne computer that has no connectors except at the bulkhead, all boards are attached by flex cables to the motherboard. Jon