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Switching ROM's on the fly?
I though Penfold did this,

I though Penfold did this, but it turns out he was using the serial port on a CIA to do the configuration.

If you want to just have N ROMs, you can use the Megabit ROM board. You could probably look at the SD2IEC for the basics of reading and responding to IEC bus signals. You would be a lot better off using the BURST protocols though, a lot easier to handle ;) Or just snooping the BUS at say D50A or something like that, above the MMUs memory range but below any mirrors. So you can just poke memory to get it to swap.

I don't want to use any IO
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