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NEC displays have a slot for them: https://www.raspberrypi.org/blog/compute-module-nec-display-...

Let's say that you're trying to create a fancy internet radio for mass production. You want to base it on linux. Instead of producing a PCB with a CPU and tons of support circuitry (hard) you can instead include a SODIMM-connector (easy) and plug in a RPI compute module.

You can get away with a much simpler design and lower production tolerances by doing this - enabling you to use less time and use cheaper production techniques.

But does this cost-saving scale?

I was always under the assumption that all-in-one minicomputers were for prototyping and hobbyist engineering. I reformat my Pi often for all the little things I want to try.

Presumably at a large scale there would be resources available to design and manufacture a completely custom board -- its the low scale applications this unlocks that make it exciting.

Revolution Pi for SCADA / IoT applications. Mounted on an industry standard EN 50022 top hat rail with a 24 VDC power supply.

https://revolution.kunbus.com/

Slice media player: http://fiveninjas.com

Edit: Old blog post with tech details: https://www.raspberrypi.org/blog/creating-and-kickstarting-s...