MOS8521R0A CIA for the Commodore 64 (6526 compatibile) (New Old Stock) - Retro 8bit Shop
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6526 Complex Interface Adaptor (CIA) - datasheet : Commodore Semiconductor Group : Free Download, Borrow, and Streaming : Internet Archive
MOS Technology CIA - Wikipedia
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MOS 6526 (CIA) - Commodore
MOS Technology CIA - Wikipedia
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MOS6526 CIA for the Commodore 64 (New Old Stock) - Retro 8bit Shop
Commodore 64 (C64) CIA Problems (Controller Problem) - YouTube
An Ode to Commies: A CIA Mystery
MJK's Commodore Hardware Overview: Commodore 64
CIA - C64-Wiki
Fixing the Commodore SX-64: Replacing the MOS 6526 – RETRO.MOE