Another board:
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The microZed compute platform plugs into the middle. The application board has eight DAC channels with filters and amps, two ADC inputs, power supplies, BIST, stuff like that. We put some parts under the Zedboard, simple stuff that shouldn't need a lot of probing or anything.
The only problem with MicroZed is that it uses a Xilinx FPGA, which requires the Vivado software, which really sucks.