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If I have a 100-pin connector that may be connected to any of several known devices (NES, SNES, Gameboy, and so forth), can the device somehow auto-detect which device it's connected to?

For some of these, it may be possible to send a reset signal, or set an NMI address and trigger an IRQ, allowing simple brute force.

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    depends on how the 100-pin connector is done. If there are pins not used for signals, I'd use them as keys. use 4 or five pins as a binary number telling what system is in that end. – UncleBod Nov 2 '19 at 14:27
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    How are you planning to connect this FPGA to the various devices? Will it be connected to the various cartridge slots, external expansion slots, or wired to the internal board directly? – Kaz Nov 2 '19 at 18:30
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    All those machines have an output that just supplies voltage. Set aside six pins for machine detection, and connect up correspondingly. Read those pins for machine detection. Have I understood the question? – Tommy Nov 2 '19 at 21:06

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