System Interrupts - Xycom AHIP6+ Manual

Chapter 2 – Installation

System Interrupts

The following table describes the interrupts used on the AHIP6+.
* BIOS setup controlled
The BIOS setup menu controls the interrupts for the serial and the parallel port.
The two Serial ports on the AHIP6+ board can be mapped to any two of the follow-
ing interrupts: 3, 4, 10, & 11 (defaults are interrupts 3 and 4). One parallel port can be
mapped to IRQ5 or IRQ7. The BIOS setup menu is used to control the location and
interrupts for the serial and parallel ports.
The BIOS controls the mapping of the PCI interrupts to AT-bus inter-
rupts. This means if a PCI device is plugged into a slot and needs an in-
terrupt, one of the AT-bus interrupts must be mapped to the PCI inter-
rupt.
Table 2- 3. System Interrupts
Interrupt Function
IRQ0 System Timer
IRQ1 Keyboard
IRQ2 Cascade
IRQ3 Serial Port*
IRQ4 Serial Port*
IRQ5 Parallel Port*
IRQ6 Floppy Controller
IRQ7 Parallel Port*
IRQ8 Real Time Clock
IRQ9 Unused
IRQ10 Serial Port*
IRQ11 Serial Port*
IRQ12 Mouse Port
IRQ13 Math Co
IRQ14 Fixed Disk
IRQ15 Unused
Note
2-3