At least the early Spikes are doable, we'd just need a skilled volunteer to spend some time on it.
maybe spike V1 stern does have the FULL SD card images on there site for just about all of them.
V2 maybe not and they are still getting updates + they are on line and that on line part may as part of the modding checks look for pinmame like stuff.
not the OS, just the program code.
but technically stern is still selling spike 1 products
so not sure how far down that rabbit hole one can go.
OS + CODE they are the full SD Card Images for SPIKE System that need to loaded to the card as an image like burning an CD



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