Making a Posibus Periperal Emulator

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Many of the PDP-8 systems that are rescued are missing the peripherals, or the peripherals require extensive restoration. I am attempting to use an Emcraft Linux SmartFusion Evaluation Kit to make a Posibus Peripheral Emulatortm. I chose the SmartFusion FPGA because it contains a Cortex M3 processor in a hard core. That eliminates the need to invent an interface between the FPGA and a processor. The Emcraft evaluation board for the SmartFusion has enough I/O to emulate 8-bit devices that send data to the processor. There is not enough I/O on the evaluation board to support receiving data from the processor. A second generation of the Posibus Peripheral Emulatortm will use the