Very rare new  93459 DC (apparently similar to the MOS 906114-01) PLA chip IC for Commodore 64?  These particular PLA chips are apparently ceramic and (therefore) less likely to overheat than most regular Commodore or MOS PLA chips!  These PLA chips shown here weigh about 3 times as much as regular Commodore 64 PLA chips-- probably because they are apparently ceramic.  The Commodore 64 PLA chip is one of the most likely chips to cause the Commodore 64 to lose its picture when they fail.  It is our experience (based on thousands of repairs we have done on Commodore 64 computers during the past 30 years) that a failed PLA chip is the cause about 30% of the time (or more) when no display screen appears on a Commodore 64 computer.  



Urgent description update (10-4-21): One person who seemed very well informed about these chips contacted us shortly after we listed this item to tell us that these chips ARE interchangeable with other PLA chips on all Commodore 64 computers except for the 64c units with the smaller boards.  We haven't verified this information independently but he is quite possibly right.   We have so many items here that we don't have extensive time to research every item but we advise any potential buyers of these chips to verify that they are what you need before ordering.

 
Please verify that these chips are what you need before ordering.

In addition to the PLA chip there are many other causes of getting a blank screen on Commodore 64 computers such as a defective power supply, bad fuse, bad ram chip(s) and/or bad video chip, etc.  Therefore you cannot assume that a PLA chip will cure a blank screen.  However, since this is a fairly likely cause of a blank Commodore 64 screen it doesn't hurt to have one or two on hand-- especially since these are getting increasingly difficult to find.