Watch a Youtube video about repairing a 1980s 8-bit computer, and you can flip a coin about whether the problem will be the presence of MT (Micron) 4264 RAM chips inside. MT RAM chips of mid 1980s vintage are notoriously unreliable. Apple, Atari, and Commodore all used them, and those chips didn’t age well.
I’ve seen them in Commodore 64s, Apple IIcs, Atari 800XLs, and Atari 65 and 130XEs.










