MSI G52-M6570XA-G22 - Manual (Page 55)

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Hardware Setup
ACR (Advanced Communication Riser) Slot
The ACR slot allows you to insert the ACR expansion cards. The ACR
specification supports modem, audio, Local Area Network (LAN), and Gigital
Subscriber Line (DSL). The ACR interface combines existing communica-
tions buses, and introduces new and advanced communications buses answer-
ing industry demand for low-cost, high-performance communications
peripherals.
PCI Interrupt Request Routing
The IRQ, acronym of interrupt request line and pronounced I-R-Q, are
hardware lines over which devices can send interrupt signals to the
microprocessor.
The PCI IRQ pins are typically connected to the PCI bus PIRQ A# ~
PIRQ D# pins as follows:
Order 1 Order 2 Order 3 Order 4
PCI Slot 1 PIRQ D# PIRQ A# PIRQ B# PIRQ C#
PCI Slot 2 PIRQ A# PIRQ B# PIRQ C# PIRQ D#
PCI Slot 3 PIRQ B# PIRQ C# PIRQ D# PIRQ A#
PCI Slot 4 PIRQ D# PIRQ A# PIRQ B# PIRQ C#
PCI Slot 5 PIRQ D# PIRQ A# PIRQ B# PIRQ C#
AGP PIRQ D#
Onboard Serial PIRQ C#
ATA