Supercat's answer was the most usefull to me, but it is in a comment :( I have one of those black ZIFs too, I like it much better than my '3M clone', but it costed maybe 10 times as much. Universal ZIF Sockets for EPROM and Micrococontroller Programmers Features. It is a bit of a compromise now, I would never use such large holes for a normal DIP socket, but is still fits OK. The holes are now so large that no trace will fit between two pins, but the autorouter did not mind :) I now made the holes larger, I'll see whether this works out OK (the file was sent to the PCB house today). 40-pin 0.5mm pitch FPC Flex Cable with A-B Connections - 25cm long. The two rows are definitely not at the standard distance from each other, yet close enough to the standard distance that two holes is out of the question, the holes would overlap which AFAIK is frowned upon by boardhouses. Adafruit Industries, Unique & fun DIY electronics and kits : Components & Parts. The ZIFs I have is marked 3M (although it is more likely a clone).
I had not realised that different brands of ZIF sockets can be very different in pin spacing. A little extra clearance around the 18 pin socket makes a ZIF substitution possible as well. My next design will replace the 28 and 40 pin sockets with one 40 pin ZIF socket. Alternatively, if you have tried this and found it to be impractical I'd like to hear that too. I used cheap AMP IC sockets from Mouser because I had them on hand.
I am looking for an eagle footprint that can accept both a standard 40 pin DIP socket or a ZIF socket.
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