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The clockport would be an option, but it's not as easy as it might first appear. Looking at the SID, it looks like it has 5 address lines (32 registers). The clockport only has 4 address lines.
IDE isn't ideal, but it has been used in the past - the Catweasel Mk 2 could optionally be connected to the IDE port instead of the clockport, for example.
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