**ONLY for purchase with a Commodore 64 Repair**
The MOS 6526 CIA chip for the Commodore 64 is the controller chip in charge of the keyboard and the serial interface. Usual faults caused by a faulty CIA are:
BASIC screen boots up normally, but no cursor
BASIC screen boots up normally, but the machine thinks keys are being pressed when they're not
BASIC screen boots up normally, but keyboard does not work
BASIC screen boots up normally, but disk drive does not work
If your C64 is suffering from one of these faults, it's usually a new CIA that you need. Many C64s have these chips socketed, but not all - if your C64 has a socketed CIA that needs replacing, simply plug the new chip in in place of the old. If not, you may need to use our Repair Service, available on this site.
This chip is a "New-Old-Stock" 6526B, the last and most reliable variation of this chip.