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External Interrupt

3 bytes added, 09:10, 21 June 2010
/* External Interrupt (INT Pin) */
The gate-array interrupt is automatically acknowledged and cleared, so external maskable interrupts should only be cleared explicitly by the Z80 performing an I/O instruction, otherwise they would conflict with the gate-array interrupt and you would not know the source of the interrupt.
(This information is mentioned in SOFT968)Section 11 "Interrupts" mentions this.
== See also ==
* [[NMI]] - Non-maskable Interrupts (more commonly used by peripherals)
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