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I am not aware of any existing spec released by Altera, however you can buy the HSMC connectors from Samtec and make your own expansion cards for the new dev kits.
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I already have the Samtec Connector (ASP-122952-01) because i want to build an expansion board for the Cyclone III Development Kit. (If somebody is interested in an EAGLE footprint for this connector, let me know.)
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For pinout/signal names on the CIII kit, see the files in Schematic folder you get when you install the software which comes on the CD in the box.
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The pinout/signal names for the HSMC connector is the point i'm interested in! Your proposal was the correct location: In the document "CycloneIII_SB_3C25.pdf" on page 11 you can find the HSMC connector.
Thanks!