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MOS 6581 SID Chip for Commodore 64 - Tested and Working - US Seller/Free ship. Shipped with USPS First Class.
There are two available. You will receive one of the chips pictured above.
Works and makes sound with dead test cartridge. As this is 30 year old electronics there are no returns or refunds or price adjustments. It worked with the cartridge and I make no further warranty.