Alright I'm not a hardware engineer I don't even like assembly. Can somebody explain how mainframe DMA is different from the DMA in your home PC? I know mainf

Alright I'm not a hardware engineer I don't even like assembly. Can somebody explain how mainframe DMA is different from the DMA in your home PC? I know mainframes have more then 16 CPUs. The memory problem we're talking about here does not apply to them, right?