A short mod on the Dual SID (SID2SID) board I recently added to my C64. This mod is required or you stand to damage the data bus on either SID at some point in future – only if both SIDs are using the same chip select and base address (dual mono, psuedo stereo).
Special thanks to Dave Curran for helping simplify this fix.
On a standard SID2SID board it’s not configured in such a way there will be a problem.
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