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) possibly less likely to overheat than most regular Commodore or MOS PLA chips! These particular 93459 DC chips have one or more slightly bent legs (possibly worse than the photos) but are still guaranteed for 30 days regardless. 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 note: We believe that these chips are the PLA chip only for the very earliest Silver Labelled (without rainbow-like multi-color stipes) Commodore 64 computers (1982 vintage only?). Apparently these oldest Commodore 64 computers cannot use the slightly newer (and much more prevalent) 906114-01 PLA chips or the 82S100 series PLA chips or the PLS100N chips but may require these 93459 DC PLA chips we are selling here. We do not believe that these chips we are selling here will work on any subsequent versions of the Commodore 64 having the rainbow-like stripes on the top or on the Commodore 64c computers. Most of the later Commodore 64 computers (prior to the 64c) had a rainbow-like color stripe just to the right of the Commodore 64 name. These particular chips that we are selling here have a little yellow dot in the bottom left corner of the front side of the chip (see photos). The best way to tell if this chip might work for you is to see if the chip you are trying to replace has the same 93459 DC number on it. The numbers following the letter "F" on the second row of characters on the top of the chip probably don't matter due to the fact that those numbers are likely just production date code numbers. The production date code number on the chip you receive may be different than the date code number of the chip shown in the photo-- but that shouldn't matter. If you have a silver labelled Commodore 64 (without the multi-color rainbow-like stripes) but the PLA chip it has been using (that you are considering replacing) does not have the same 93459 DC part number as these we are selling here you may have a Commodore 64 with a different circuit board than what these chips here are compatible with. description update 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.