User`s manual

DIGITAL-LOGIC AG MPC40/A/B/C, MPC41 Manual V1.4C

4.11.2 Interrupt Controllers

An 8259A compatible interrupt controller, within the chipset device, provides seven prioritized interrupt levels.

Of these, several are normally associated with the board's onboard device interfaces and controllers, and

several are available on the AT expansion bus.

Interrupt Sources onboard used

IRQ0 ROM-BIOS clock tick function, from timer 0 yes

IRQ1 Keyboard controller output buffer full yes

IRQ2 Used for cascade 2. 8259 yes

IRQ3 COM2 (fix) yes

IRQ4 COM1 (fix) yes

IRQ5 Reserved yes

IRQ6 Not used (if disabled Floppy function) yes

IRQ7 Reserved for LPT1 yes

IRQ8 System CMOS / real time clock yes

IRQ9 ACPI-Compliant system

PCI-9 for USB

PCI-9 for LAN

PCI-9 for Sound

PCI-9 for Firewire

yes

IRQ10 Reserved for PCMCIA Controller socket 1 No

IRQ11 Reserved for PCMCIA Controller socket 2 No

IRQ12 PS/2 mouse Yes

IRQ13 Math coprocessor Yes

IRQ14 Harddisk Primary - IDE Yes

IRQ15 CD/DVD-Drive DIE yes

Attention:

LPT1: Printerfunction without IRQ-support, if needed use an USB-Printer

FD: No floppy support, use always a USB-Floppy