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I am creating an OS in PURE ASSEMBLY. I have a microkernel capable of working with cooperative multithreading, but I have trouble using hardware interrupts for preemptive threading. Could anyone help me with this? Ralfy's Interrupt List was not very useful at all. A tutorial would be ideal with some asm code.

Writing an OS in pure asm, is nothing to be proud of.
Is your problem, that you wont to give priorities to hardware interrupts? (And make them execute preemtive, if it's priority is high enougth)
Anton.