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[Hide] (19.4MB, 4051x2315) https://en.wikipedia.org/wiki/Eurocard_(printed_circuit_board)
>Eurocard is an IEEE standard format for printed circuit board (PCB) cards that can be plugged together into a standard chassis which, in turn, can be mounted in a 19-inch rack. The chassis consists of a series of slotted card guides on the top and bottom, into which the cards are slid so they stand on end, like books on a shelf. At the spine of each card is one or more connectors which plug into mating connectors on a backplane that closes the rear of the chassis.
It is a physical format only, so you can use whatever connectors with whatever hardware you want, and 100mm version is pretty close to standard PCI Express card sizes. A 16x PCIe connector is also less than 100mm long, so you could design Eurocards with that connector. Maybe it would be even possible to design Eurocards and PCIe cards in tandem, as the main difference would be placing the connector either at the end or at the bottom. Still, what I am really thinking about is how 10" racks are getting popular: you could make a 10" 3U PCIe-Eurocard that could be used to house anything from a large variety of SBCs to gigantic RAM cards to ridiculous SSD farms. I could see it being a hit with certain hobbyists if you turn old systems into Eurocard SBCs, so that you could plug an Amiga and a Macintosh and Pentium II into the same 3U rack.