@janbeta funny. Those were almost the only two chips that were good on my last shortboard…

@root42 C64s are always a surprise, I guess! 😅

@root42 Yeah, the 8500s break a lot for some reason. RAM seems to always be an issue but not too often on the short boards in my experience. Mask ROMs are usually pretty unlikely to break, at least in more recent systems like this. The older MOS ROMs (in the VIC20 for example) break all the time as far as I can tell from my repairs. I think this C64 got overvoltage at some point. RAM and ROMs seem to be the first things to break in that case (both RAMs were shorted and boiling hot in this one).

@janbeta @root42 I also had more than one C128s with broken 8502-s.

Remember, these are the same generation as wonky 264 series chips, like 7501/8501s and TEDs... But probably their potential problems are less well known - also, maybe more of these are in Europe, which probably means this info is less well spread in the global retro scene. But I'm just speculating here.

@chainq @root42 That would definitely be an explanation!

@janbeta @chainq @root42 Strange, the 8500 should last longer as they run cooler than the 6510? You don't have to heatsink them...

@tinspin @janbeta @chainq same with the 8501. But those had manufacturing issues so they die earlier.

@tinspin @chainq @root42 It doesn’t have anything to do with heat in this case, it seems. Probably something went wrong during production/design that makes these disintegrate more rapidly than the original 6510s.

@root42 @janbeta @chainq Do you know if certain dates are more prone than others? Maybe go back and look if you have a dead parts box?

@tinspin @janbeta @chainq I can only speak of 8501. it’s the R1 that are at danger. R4 seem to be fine. My last damaged 8500 was damaged probably by overvoltage. So no fault of its own