The Pictorial C64 Fault Guide

General tips - CIA (U1, U2)

The CIAs (Complex Interface Adapters) are among the most common chips to fail in a C64. They run fairly cool and don't usually fail spontaneously, but are directly connected to the I/O ports and so very vulnerable to static electricity - the joystick ports in the case of the CIA1 and the Serial port in case of the CIA2. To prevent damage, never plug anything in or out while the machine is powered on. Also make sure the connectors and cables are in good shape as they can cause problems too.

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