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P
RESARIO
N
OTEBOOK
M
AINTENANCE
AND
S
ERVICE
G
UIDE
1800 S
ERIES
Presario 1800/1800T Series
Models: XL280, XL380, XL381,
and XL390
System Interrupts
System DMA
Hardware
IRQ
System Function
Hardware
IRQ
System Function
IRQ 0 System timer IRQ 10 Available
IRQ 1 Standard 101/102-key or
Microsoft Natural Keyboard
IRQ 11 Intel
®
Pro/100S Mobile LAN
on Motherboard
IRQ 2 Programmable Interrupt
Controller
IRQ 11 Texas Instruments PCI-1410
CardBus Controller
IRQ 3 Lucent 56K V.90 PCI DF Modem IRQ 11 ACPI IRQ Holder for PCI IRQ
Steering
IRQ 3 ACPI IRQ Holder for PCI IRQ
Steering
IRQ 11 Intel
®
82371AB/EB PCI to
USB Universal Host Controller
IRQ 4 Communications Port (COM1) IRQ 11 ACPI IRQ Holder for PCI IRQ
Steering
IRQ 5 ESS SOLO-1 PCI AudioDrive IRQ 12 Synaptics PS/2 TouchPad
IRQ 5 ACPI IRQ Holder for PCI IRQ
Steering
IRQ 13 Numeric Data Processor
IRQ 5 RAGE Mobility AGP (English) IRQ 14 Intel
®
82371AB/EB PCI Bus
Master IDE Controller
IRQ 6 Standard Floppy Disk Controller IRQ 14 Primary IDE Controller (Dual
FIFO)
IRQ 7 Printer Port (LPT1) IRQ 15 Intel
®
82371AB/EB PCI Bus
Master IDE Controller
IRQ 8 System CMOS/Real Time Clock IRQ 15 Secondary IDE Controller
(Dual FIFO)
IRQ 9 SCI IRQ used by ACPI Bus
Hardware
DMA
System Function
DMA 1 ESS SOLO-1 DOS Emulation
DMA 2 Standard Floppy Disk Controller
DMA 4 Direct Memory Access Controller