12 Pin Out System
Interrupts¶
8086 has 2 interrupts.
| Maskable | Non-Maskable | |
|---|---|---|
| controlled by the interrupt flag | ||
| checks interrupt flag | ✅ | ❌ |
| works when | interrupt flag is high | |
| input | INTR (Interrupt Request) | NMI |
| output | \(\overline{INTA}\) (Interrupt Acknowledge) |
Hold¶
Input Signal to the processor from the bus masters as a request to control the bus.
Usually by DMA controller.
HLDA¶
Hold Acknowledge
Output Signal from the processor to the bus master requesting control.
When high, acknowledged