My 1984 IBM PC AT has 512K on the motherboard. I think all of the ATs have 512K on the motherboard, but the chip setup is kind of odd - 4 banks of 128K modules. And the modules look like two memory chips stacked on top of each other with their legs soldered together.
There had to be a trick that made this work. If both memory chips in a stack were exactly the same, they would both try to respond to requests at the same time. They have to be different. My bet is that they are both 64K chips, and one is just slightly different than the other in terms of addressing. Does anybody know exactly what the addressing difference is?
Mike
There had to be a trick that made this work. If both memory chips in a stack were exactly the same, they would both try to respond to requests at the same time. They have to be different. My bet is that they are both 64K chips, and one is just slightly different than the other in terms of addressing. Does anybody know exactly what the addressing difference is?
Mike