hello,
this is probably a silly question. however, i haven't found explicit information on the web and i need straight forward clarification.
question 1: obviously, if the PIC is initialized to require manual EOI, the PIC must be acknowledged by sending EOI from the hardware interrupt handler. however, i'm not sure if this is always required or only required if higher priority hardware interrupts are to be serviced (nested). what is required for either condition?
question 2: do cpu exception handlers need to send and EOI to the PIC? i would think not, and may cause problems i would think. i'm wondering because i saw the unsubstantiated usage as such.
question 3: the same question at question 2 only regarding software interrupts called by INT n.
thanks, bryan