One of the problems in engineering is knowing when to stop. DC37
connectors are not uncommon, exist in IDC versions (easy attachment).
50-pin D-subs are far less common. IDC headers aren't made for
They're not particularly hard to get (I can't think of a company the
sells DC37s but not DD50s, for example), but the IDC version of the DD50
is darn expensive (I speak from bitter experience here).
frequent use and are subject to pin breakage and
stress on the PCB.
There is, of course, the 50 pin microribbon connector. That's fairly easy
to get in solder and IDC versions.
-tony